813138886 has 16 divisors (see below), whose sum is σ = 1394364960. Its totient is φ = 348384960.

The previous prime is 813138871. The next prime is 813138889. The reversal of 813138886 is 688831318.

813138886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×813138886² = 1322389695850641992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813138889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58410 + ... + 70978.

It is an arithmetic number, because the mean of its divisors is an integer number (87147810).

Almost surely, 2^813138886 is an apocalyptic number.

813138886 is a deficient number, since it is larger than the sum of its proper divisors (581226074).

813138886 is a wasteful number, since it uses less digits than its factorization.

813138886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17199.

The product of its digits is 221184, while the sum is 46.

The square root of 813138886 is about 28515.5902271021. The cubic root of 813138886 is about 933.3723045235.

The spelling of 813138886 in words is "eight hundred thirteen million, one hundred thirty-eight thousand, eight hundred eighty-six".