Is 990 a deficient number and what is its deficiency?

Is 990 a deficient number?

Here we will explain and calculate if 990 is a deficient number and its deficiency if applicable.

990 is a deficient number if the sum of its proper divisors is less than 990.

The sum of its proper divisors is calculated as follows: 1 + 2 + 3 + 5 + 6 + 9 + 10 + 11 + 15 + 18 + 22 + 30 + 33 + 45 + 55 + 66 + 90 + 99 + 110 + 165 + 198 + 330 + 495 = 1818.

1818 is not less than 990. Therefore, 990 is not a deficient number.

The deficiency of 990 is 990 minus the sum of its proper divisors. Thus, the deficiency of 990 is 990 - 1818 = No Deficiency

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