399407872 has 18 divisors (see below), whose sum is σ = 797256068. Its totient is φ = 199703808.

The previous prime is 399407863. The next prime is 399407887. The reversal of 399407872 is 278704993.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 779838 + ... + 780349.

Almost surely, 2^399407872 is an apocalyptic number.

399407872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

399407872 is a deficient number, since it is larger than the sum of its proper divisors (397848196).

399407872 is an equidigital number, since it uses as much as digits as its factorization.

399407872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560203 (or 1560189 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 399407872 is about 19985.1913175731. The cubic root of 399407872 is about 736.4425504800.

The spelling of 399407872 in words is "three hundred ninety-nine million, four hundred seven thousand, eight hundred seventy-two".