813900988 has 48 divisors (see below), whose sum is σ = 1506879360. Its totient is φ = 384208704.

The previous prime is 813900961. The next prime is 813901051. The reversal of 813900988 is 889009318.

It is a super-2 number, since 2×813900988² = 1324869636534752288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 724195 + ... + 725317.

It is an arithmetic number, because the mean of its divisors is an integer number (31393320).

Almost surely, 2^813900988 is an apocalyptic number.

It is an amenable number.

813900988 is a deficient number, since it is larger than the sum of its proper divisors (692978372).

813900988 is a wasteful number, since it uses less digits than its factorization.

813900988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 813900988 is about 28528.9499982036. The cubic root of 813900988 is about 933.6638097845.

The spelling of 813900988 in words is "eight hundred thirteen million, nine hundred thousand, nine hundred eighty-eight".