800821904 has 20 divisors (see below), whose sum is σ = 1552807980. Its totient is φ = 400097280.

The previous prime is 800821883. The next prime is 800821933. The reversal of 800821904 is 409128008.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 486114304 + 314707600 = 22048^2 + 17740^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192 + ... + 40080.

It is an arithmetic number, because the mean of its divisors is an integer number (77640399).

Almost surely, 2^800821904 is an apocalyptic number.

It is an amenable number.

800821904 is a deficient number, since it is larger than the sum of its proper divisors (751986076).

800821904 is a wasteful number, since it uses less digits than its factorization.

800821904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39218 (or 39212 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 800821904 is about 28298.7968648846. The cubic root of 800821904 is about 928.6355696150.

The spelling of 800821904 in words is "eight hundred million, eight hundred twenty-one thousand, nine hundred four".