399496320 has 256 divisors, whose sum is σ = 1441872000. Its totient is φ = 104509440.

The previous prime is 399496319. The next prime is 399496367. The reversal of 399496320 is 23694993.

399496320 is a `hidden beast` number, since 3 + 9 + 9 + 4 + 9 + 632 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1053891 + ... + 1054269.

Almost surely, 2^399496320 is an apocalyptic number.

399496320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399496320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720936000).

399496320 is an abundant number, since it is smaller than the sum of its proper divisors (1042375680).

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

399496320 is a wasteful number, since it uses less digits than its factorization.

399496320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The square root of 399496320 is about 19987.4040335407. The cubic root of 399496320 is about 736.4969076653.

The spelling of 399496320 in words is "three hundred ninety-nine million, four hundred ninety-six thousand, three hundred twenty".