Is 987 a deficient number and what is its deficiency?

Is 987 a deficient number?

Here we will explain and calculate if 987 is a deficient number and its deficiency if applicable.

987 is a deficient number if the sum of its proper divisors is less than 987.

The sum of its proper divisors is calculated as follows: 1 + 3 + 7 + 21 + 47 + 141 + 329 = 549.

549 is less than 987. Therefore, 987 is a deficient number.

The deficiency of 987 is 987 minus the sum of its proper divisors. Thus, the deficiency of 987 is 987 - 549 = 438

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