399173772 has 24 divisors (see below), whose sum is σ = 940113216. Its totient is φ = 131813968.

The previous prime is 399173771. The next prime is 399173779. The reversal of 399173772 is 277371993.

It is not an unprimeable number, because it can be changed into a prime (399173771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154158 + ... + 156725.

It is an arithmetic number, because the mean of its divisors is an integer number (39171384).

Almost surely, 2^399173772 is an apocalyptic number.

It is an amenable number.

399173772 is an abundant number, since it is smaller than the sum of its proper divisors (540939444).

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

399173772 is a wasteful number, since it uses less digits than its factorization.

399173772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310997 (or 310995 counting only the distinct ones).

The product of its digits is 500094, while the sum is 48.

The square root of 399173772 is about 19979.3336225210. Note that the first 3 decimals coincide. The cubic root of 399173772 is about 736.2986417036.

The spelling of 399173772 in words is "three hundred ninety-nine million, one hundred seventy-three thousand, seven hundred seventy-two".