Is 99 a deficient number and what is its deficiency?

Is 99 a deficient number?

Here we will explain and calculate if 99 is a deficient number and its deficiency if applicable.

99 is a deficient number if the sum of its proper divisors is less than 99.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 11 + 33 = 57.

57 is less than 99. Therefore, 99 is a deficient number.

The deficiency of 99 is 99 minus the sum of its proper divisors. Thus, the deficiency of 99 is 99 - 57 = 42

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