Is 1989 a deficient number and what is its deficiency?

Is 1989 a deficient number?

Here we will explain and calculate if 1989 is a deficient number and its deficiency if applicable.

1989 is a deficient number if the sum of its proper divisors is less than 1989.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 13 + 17 + 39 + 51 + 117 + 153 + 221 + 663 = 1287.

1287 is less than 1989. Therefore, 1989 is a deficient number.

The deficiency of 1989 is 1989 minus the sum of its proper divisors. Thus, the deficiency of 1989 is 1989 - 1287 = 702

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