Is 15 a deficient number and what is its deficiency?

Is 15 a deficient number?

Here we will explain and calculate if 15 is a deficient number and its deficiency if applicable.

15 is a deficient number if the sum of its proper divisors is less than 15.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 = 9.

9 is less than 15. Therefore, 15 is a deficient number.

The deficiency of 15 is 15 minus the sum of its proper divisors. Thus, the deficiency of 15 is 15 - 9 = 6

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