Is 1287 a deficient number and what is its deficiency?

Is 1287 a deficient number?

Here we will explain and calculate if 1287 is a deficient number and its deficiency if applicable.

1287 is a deficient number if the sum of its proper divisors is less than 1287.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 11 + 13 + 33 + 39 + 99 + 117 + 143 + 429 = 897.

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

The deficiency of 1287 is 1287 minus the sum of its proper divisors. Thus, the deficiency of 1287 is 1287 - 897 = 390

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