Divisor Sum of 1,438,983

Example of Sigma Function of Integer

 * $\sigma \left({1 \, 438 \, 983}\right) = 2 \, 614 \, 248$

where $\sigma$ denotes the $\sigma$ function.

Proof
We have that:
 * $1 \, 438 \, 983 = 3^2 \times 7^2 \times 13 \times 251$

Hence: