809904172 has 48 divisors (see below), whose sum is σ = 1769983488. Its totient is φ = 315025920.

The previous prime is 809904169. The next prime is 809904209. The reversal of 809904172 is 271409908.

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, 222108 + ... + 225724.

It is an arithmetic number, because the mean of its divisors is an integer number (36874656).

Almost surely, 2^809904172 is an apocalyptic number.

It is an amenable number.

809904172 is an abundant number, since it is smaller than the sum of its proper divisors (960079316).

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

809904172 is a wasteful number, since it uses less digits than its factorization.

809904172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366 (or 4364 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 809904172 is about 28458.8153653661. The cubic root of 809904172 is about 932.1329898578.

The spelling of 809904172 in words is "eight hundred nine million, nine hundred four thousand, one hundred seventy-two".