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Harshad Number
An integer divisible by the sum of its digits is said to be a Harshad number.
An integer divisible by the sum of its digits is said to be a Harshad number. You are given an integer x. Return the sum of the digits of x if x is a Harshad number, otherwise, return -1.
Example 1
Input: x = 18
Output: 9
Explanation: The sum of digits of x is 9 . 18 is divisible by 9 . So 18 is a Harshad number and the answer is 9 .
Example 2
Input: x = 23
Output: -1
Explanation: The sum of digits of x is 5 . 23 is not divisible by 5 . So 23 is not a Harshad number and the answer is -1 .
Constraints
- 1 <= x <= 100
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