{ "data": { "question": { "questionId": "3371", "questionFrontendId": "3099", "boundTopicId": null, "title": "Harshad Number", "titleSlug": "harshad-number", "content": "

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.

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Example 1:

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Input: x = 18

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Output: 9

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Explanation:

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The sum of digits of x is 9. 18 is divisible by 9. So 18 is a Harshad number and the answer is 9.

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Example 2:

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Input: x = 23

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Output: -1

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Explanation:

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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.

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Constraints:

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