Is 1981 a deficient number and what is its deficiency?

Is 1981 a deficient number?

Here we will explain and calculate if 1981 is a deficient number and its deficiency if applicable.

1981 is a deficient number if the sum of its proper divisors is less than 1981.

The sum of its proper divisors is calculated as follows: 1 + 7 + 283 = 291.

291 is less than 1981. Therefore, 1981 is a deficient number.

The deficiency of 1981 is 1981 minus the sum of its proper divisors. Thus, the deficiency of 1981 is 1981 - 291 = 1690

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