813893172 has 24 divisors (see below), whose sum is σ = 1939491456. Its totient is φ = 265525248.

The previous prime is 813893167. The next prime is 813893183. The reversal of 813893172 is 271398318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720973 + ... + 722100.

It is an arithmetic number, because the mean of its divisors is an integer number (80812144).

Almost surely, 2^813893172 is an apocalyptic number.

It is an amenable number.

813893172 is an abundant number, since it is smaller than the sum of its proper divisors (1125598284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813893172 is a wasteful number, since it uses less digits than its factorization.

813893172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443127 (or 1443125 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 813893172 is about 28528.8130142142. The cubic root of 813893172 is about 933.6608210755.

The spelling of 813893172 in words is "eight hundred thirteen million, eight hundred ninety-three thousand, one hundred seventy-two".