Is 1089 a deficient number and what is its deficiency?

Is 1089 a deficient number?

Here we will explain and calculate if 1089 is a deficient number and its deficiency if applicable.

1089 is a deficient number if the sum of its proper divisors is less than 1089.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 11 + 33 + 99 + 121 + 363 = 640.

640 is less than 1089. Therefore, 1089 is a deficient number.

The deficiency of 1089 is 1089 minus the sum of its proper divisors. Thus, the deficiency of 1089 is 1089 - 640 = 449

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