Is 3991 a deficient number and what is its deficiency?

Is 3991 a deficient number?

Here we will explain and calculate if 3991 is a deficient number and its deficiency if applicable.

3991 is a deficient number if the sum of its proper divisors is less than 3991.

The sum of its proper divisors is calculated as follows: 1 + 13 + 307 = 321.

321 is less than 3991. Therefore, 3991 is a deficient number.

The deficiency of 3991 is 3991 minus the sum of its proper divisors. Thus, the deficiency of 3991 is 3991 - 321 = 3670

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