diff --git a/src/PhpSpreadsheet/Calculation/TextData.php b/src/PhpSpreadsheet/Calculation/TextData.php
index da958836..f8974402 100644
--- a/src/PhpSpreadsheet/Calculation/TextData.php
+++ b/src/PhpSpreadsheet/Calculation/TextData.php
@@ -27,15 +27,15 @@ class TextData
     {
         $character = Functions::flattenSingleValue($character);
 
-        if ((!is_numeric($character)) || ($character < 0)) {
+        if (!is_numeric($character)) {
+            return Functions::VALUE();
+        }
+        $character = (int) $character;
+        if ($character < 1 || $character > 255) {
             return Functions::VALUE();
         }
 
-        if (function_exists('iconv')) {
-            return iconv('UCS-4LE', 'UTF-8', pack('V', $character));
-        }
-
-        return mb_convert_encoding('&#' . (int) $character . ';', 'UTF-8', 'HTML-ENTITIES');
+        return iconv('UCS-4LE', 'UTF-8', pack('V', $character));
     }
 
     /**
@@ -160,7 +160,7 @@ class TextData
 
         // Validate parameters
         if (!is_numeric($value) || !is_numeric($decimals)) {
-            return Functions::NAN();
+            return Functions::VALUE();
         }
         $decimals = floor($decimals);
 
@@ -174,6 +174,7 @@ class TextData
             }
             $value = MathTrig::MROUND($value, $round);
         }
+        $mask = "$mask;($mask)";
 
         return NumberFormat::toFormattedString($value, $mask);
     }
@@ -265,7 +266,7 @@ class TextData
 
         // Validate parameters
         if (!is_numeric($value) || !is_numeric($decimals)) {
-            return Functions::NAN();
+            return Functions::VALUE();
         }
         $decimals = (int) floor($decimals);
 
diff --git a/tests/data/Calculation/TextData/CHAR.php b/tests/data/Calculation/TextData/CHAR.php
index 1751699c..276d7015 100644
--- a/tests/data/Calculation/TextData/CHAR.php
+++ b/tests/data/Calculation/TextData/CHAR.php
@@ -9,6 +9,10 @@ return [
         '#VALUE!',
         -5,
     ],
+    [
+        '#VALUE!',
+        0,
+    ],
     [
         'A',
         65,
@@ -22,27 +26,39 @@ return [
         126,
     ],
     [
-        '⽇',
+        'Á',
+        193,
+    ],
+    [
+        'ÿ',
+        255,
+    ],
+    [
+        '#VALUE!',
+        256,
+    ],
+    [
+        '#VALUE!', // '⽇',
         12103,
     ],
     [
-        'œ',
+        '#VALUE!', // 'œ',
         0x153,
     ],
     [
-        'ƒ',
+        '#VALUE!', // 'ƒ',
         0x192,
     ],
     [
-        '℅',
+        '#VALUE!', // '℅',
         0x2105,
     ],
     [
-        '∑',
+        '#VALUE!', // '∑',
         0x2211,
     ],
     [
-        '†',
+        '#VALUE!', // '†',
         0x2020,
     ],
 ];
diff --git a/tests/data/Calculation/TextData/DOLLAR.php b/tests/data/Calculation/TextData/DOLLAR.php
index 95555e7c..67f394bb 100644
--- a/tests/data/Calculation/TextData/DOLLAR.php
+++ b/tests/data/Calculation/TextData/DOLLAR.php
@@ -6,11 +6,20 @@ return [
         123.456,
         2,
     ],
+    [
+        '$123.46',
+        123.456,
+    ],
     [
         '$123.32',
         123.321,
         2,
     ],
+    [
+        '($123.32)',
+        -123.321,
+        2,
+    ],
     [
         '$1,235,000',
         1234567,
@@ -22,12 +31,17 @@ return [
         -5,
     ],
     [
-        '#NUM!',
+        '($1,200,000)',
+        -1234567,
+        -5,
+    ],
+    [
+        '#VALUE!',
         'ABC',
         2,
     ],
     [
-        '#NUM!',
+        '#VALUE!',
         123.456,
         'ABC',
     ],
diff --git a/tests/data/Calculation/TextData/FIXED.php b/tests/data/Calculation/TextData/FIXED.php
index b8bb36ca..2083ecce 100644
--- a/tests/data/Calculation/TextData/FIXED.php
+++ b/tests/data/Calculation/TextData/FIXED.php
@@ -20,13 +20,41 @@ return [
         true,
     ],
     [
-        '#NUM!',
+        '-123456.79',
+        -123456.789,
+        2,
+        true,
+    ],
+    [
+        '123500',
+        123456.789,
+        -2,
+        true,
+    ],
+    [
+        '123,500',
+        123456.789,
+        -2,
+    ],
+    [
+        '-123500',
+        -123456.789,
+        -2,
+        true,
+    ],
+    [
+        '-123,500',
+        -123456.789,
+        -2,
+    ],
+    [
+        '#VALUE!',
         'ABC',
         2,
         null,
     ],
     [
-        '#NUM!',
+        '#VALUE!',
         123.456,
         'ABC',
         null,
diff --git a/tests/data/Calculation/TextData/SEARCH.php b/tests/data/Calculation/TextData/SEARCH.php
index 75aa7cea..28cd98f8 100644
--- a/tests/data/Calculation/TextData/SEARCH.php
+++ b/tests/data/Calculation/TextData/SEARCH.php
@@ -54,6 +54,11 @@ return [
         'Mark Baker',
         2,
     ],
+    [
+        1,
+        '',
+        'Mark Baker',
+    ],
     [
         '#VALUE!',
         'BITE',