Is 1640 a deficient number and what is its deficiency?

Is 1640 a deficient number?

Here we will explain and calculate if 1640 is a deficient number and its deficiency if applicable.

1640 is a deficient number if the sum of its proper divisors is less than 1640.

The sum of its proper divisors is calculated as follows: 1 + 2 + 4 + 5 + 8 + 10 + 20 + 40 + 41 + 82 + 164 + 205 + 328 + 410 + 820 = 2140.

2140 is not less than 1640. Therefore, 1640 is not a deficient number.

The deficiency of 1640 is 1640 minus the sum of its proper divisors. Thus, the deficiency of 1640 is 1640 - 2140 = No Deficiency

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