Is 999 a deficient number and what is its deficiency?

Is 999 a deficient number?

Here we will explain and calculate if 999 is a deficient number and its deficiency if applicable.

999 is a deficient number if the sum of its proper divisors is less than 999.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 27 + 37 + 111 + 333 = 521.

521 is less than 999. Therefore, 999 is a deficient number.

The deficiency of 999 is 999 minus the sum of its proper divisors. Thus, the deficiency of 999 is 999 - 521 = 478

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