Is 1690 a deficient number and what is its deficiency?

Is 1690 a deficient number?

Here we will explain and calculate if 1690 is a deficient number and its deficiency if applicable.

1690 is a deficient number if the sum of its proper divisors is less than 1690.

The sum of its proper divisors is calculated as follows: 1 + 2 + 5 + 10 + 13 + 26 + 65 + 130 + 169 + 338 + 845 = 1604.

1604 is less than 1690. Therefore, 1690 is a deficient number.

The deficiency of 1690 is 1690 minus the sum of its proper divisors. Thus, the deficiency of 1690 is 1690 - 1604 = 86

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