{ "data": { "question": { "questionId": "1585", "questionFrontendId": "1492", "boundTopicId": null, "title": "The kth Factor of n", "titleSlug": "the-kth-factor-of-n", "content": "

You are given two positive integers n and k. A factor of an integer n is defined as an integer i where n % i == 0.

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Consider a list of all factors of n sorted in ascending order, return the kth factor in this list or return -1 if n has less than k factors.

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Example 1:

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\nInput: n = 12, k = 3\nOutput: 3\nExplanation: Factors list is [1, 2, 3, 4, 6, 12], the 3rd factor is 3.\n
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Example 2:

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\nInput: n = 7, k = 2\nOutput: 7\nExplanation: Factors list is [1, 7], the 2nd factor is 7.\n
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Example 3:

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\nInput: n = 4, k = 4\nOutput: -1\nExplanation: Factors list is [1, 2, 4], there is only 3 factors. We should return -1.\n
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Constraints:

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Follow up:

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Could you solve this problem in less than O(n) complexity?

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