diff --git a/Maths/KrishnamurthyNumber.js b/Maths/KrishnamurthyNumber.js
new file mode 100644
index 0000000000..90c56538d3
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+++ b/Maths/KrishnamurthyNumber.js
@@ -0,0 +1,29 @@
+/**
+ * @function isKrishnamurthyNumber
+ * @description A Krishnamurthy number (also called a Strong number) is a
+ *   number whose sum of factorials of its digits equals the number itself.
+ *   For example, 145: 1! + 4! + 5! = 1 + 24 + 120 = 145.
+ * @param {number} n - A positive integer
+ * @returns {boolean} - True if n is a Krishnamurthy number, false otherwise
+ * @see https://en.wikipedia.org/wiki/Krishnamurthy_number
+ * @example isKrishnamurthyNumber(145) => true
+ * @example isKrishnamurthyNumber(40585) => true
+ * @example isKrishnamurthyNumber(100) => false
+ */
+const isKrishnamurthyNumber = (n) => {
+  if (!Number.isInteger(n) || n < 1) {
+    throw new TypeError('Input must be a positive integer')
+  }
+  const factorial = (num) => {
+    if (num === 0 || num === 1) return 1
+    let result = 1
+    for (let i = 2; i <= num; i++) result *= i
+    return result
+  }
+  const sum = String(n)
+    .split('')
+    .reduce((acc, d) => acc + factorial(Number(d)), 0)
+  return sum === n
+}
+
+export { isKrishnamurthyNumber }
diff --git a/Maths/test/KrishnamurthyNumber.test.js b/Maths/test/KrishnamurthyNumber.test.js
new file mode 100644
index 0000000000..585efddb03
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+++ b/Maths/test/KrishnamurthyNumber.test.js
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+import { isKrishnamurthyNumber } from '../KrishnamurthyNumber.js'
+
+describe('isKrishnamurthyNumber', () => {
+  test('1 is a Krishnamurthy number (1!=1)', () => {
+    expect(isKrishnamurthyNumber(1)).toBe(true)
+  })
+
+  test('2 is a Krishnamurthy number (2!=2)', () => {
+    expect(isKrishnamurthyNumber(2)).toBe(true)
+  })
+
+  test('145 is a Krishnamurthy number (1!+4!+5!=145)', () => {
+    expect(isKrishnamurthyNumber(145)).toBe(true)
+  })
+
+  test('40585 is a Krishnamurthy number', () => {
+    expect(isKrishnamurthyNumber(40585)).toBe(true)
+  })
+
+  test('100 is NOT a Krishnamurthy number', () => {
+    expect(isKrishnamurthyNumber(100)).toBe(false)
+  })
+
+  test('123 is NOT a Krishnamurthy number', () => {
+    expect(isKrishnamurthyNumber(123)).toBe(false)
+  })
+
+  test('10 is NOT a Krishnamurthy number', () => {
+    expect(isKrishnamurthyNumber(10)).toBe(false)
+  })
+
+  test('throws TypeError for zero', () => {
+    expect(() => isKrishnamurthyNumber(0)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for negative input', () => {
+    expect(() => isKrishnamurthyNumber(-145)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for float input', () => {
+    expect(() => isKrishnamurthyNumber(14.5)).toThrow(TypeError)
+  })
+})