Added StrongNumber program

Author: 2393117

Maths/StrongNumber.js

@@ -0,0 +1,30 @@
+function factorial(n) {
+    if (n === 0 || n === 1) {
+        return 1;
+    }
+    let result = 1;
+    for (let i = 2; i <= n; i++) {
+        result *= i;
+    }
+    return result;
+}
+
+function isStrongNum(num) {
+    let sum = 0;
+    let originalNum = num;
+
+    while (num > 0) {
+        let digit = num % 10;
+        sum += factorial(digit);
+        num = Math.floor(num / 10);
+    }
+    
+    return sum === originalNum;
+}
+let number=parseInt(prompt("Enter a number"))
+if (isStrongNum(number)){
+    console.log("" + number + " is a Strong Number");
+}
+else{
+    console.log("" + number + " is not a Strong Number");
+}