399174912 has 72 divisors (see below), whose sum is σ = 1180450880. Its totient is φ = 133056000.

The previous prime is 399174899. The next prime is 399174917. The reversal of 399174912 is 219471993.

399174912 is a `hidden beast` number, since 399 + 174 + 91 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×399174912² = 318681220740415488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399174917) 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, 21964 + ... + 35787.

Almost surely, 2^399174912 is an apocalyptic number.

399174912 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

399174912 is an abundant number, since it is smaller than the sum of its proper divisors (781275968).

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

399174912 is an equidigital number, since it uses as much as digits as its factorization.

399174912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57776 (or 57756 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 399174912 is about 19979.3621519807. The cubic root of 399174912 is about 736.2993426344.

The spelling of 399174912 in words is "three hundred ninety-nine million, one hundred seventy-four thousand, nine hundred twelve".