Ugly Number

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

Tags

Math

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Easy Solution

/**
 * @param {number} num
 * @return {boolean}
 */
var isUgly = function (num) {
    while (num > 1) {
        if (num % 2 === 0) {
            num = num / 2;
        } else if (num % 5 === 0) {
            num = num / 5;
        } else if (num % 3 === 0) {
            num = num / 3;
        } else {
            return false;
        }
    }

    if (num === 1) {
        return true;
    } else {
        return false;
    }
};