813985786 has 32 divisors (see below), whose sum is σ = 1294368768. Its totient is φ = 383307120.

The previous prime is 813985763. The next prime is 813985793. The reversal of 813985786 is 687589318.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1340695 + ... + 1341301.

It is an arithmetic number, because the mean of its divisors is an integer number (40449024).

Almost surely, 2^813985786 is an apocalyptic number.

813985786 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

813985786 is a deficient number, since it is larger than the sum of its proper divisors (480382982).

813985786 is a wasteful number, since it uses less digits than its factorization.

813985786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186.

The product of its digits is 2903040, while the sum is 55.

The square root of 813985786 is about 28530.4361340657. The cubic root of 813985786 is about 933.6962339063.

The spelling of 813985786 in words is "eight hundred thirteen million, nine hundred eighty-five thousand, seven hundred eighty-six".