Is 639 a deficient number and what is its deficiency?

Is 639 a deficient number?

Here we will explain and calculate if 639 is a deficient number and its deficiency if applicable.

639 is a deficient number if the sum of its proper divisors is less than 639.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 71 + 213 = 297.

297 is less than 639. Therefore, 639 is a deficient number.

The deficiency of 639 is 639 minus the sum of its proper divisors. Thus, the deficiency of 639 is 639 - 297 = 342

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