everyutil/number/isPerfectNumber.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isPerfectNumber = void 0;
/**
 * Checks if a number is a perfect number (equal to sum of its divisors except itself).
 * @author @dailker
 * @param {number} n - The number.
 * @returns {boolean}
 */
function isPerfectNumber(n) {
    if (n <= 1)
        return false;
    let sum = 1;
    for (let i = 2; i <= Math.sqrt(n); i++) {
        if (n % i === 0) {
            sum += i;
            if (i !== n / i)
                sum += n / i;
        }
    }
    return sum === n;
}
exports.isPerfectNumber = isPerfectNumber;