399787320 has 32 divisors (see below), whose sum is σ = 1199362320. Its totient is φ = 106609920.

The previous prime is 399787319. The next prime is 399787369. The reversal of 399787320 is 23787993.

It is a self number, because there is not a number n which added to its sum of digits gives 399787320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1665661 + ... + 1665900.

Almost surely, 2^399787320 is an apocalyptic number.

399787320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399787320 is an abundant number, since it is smaller than the sum of its proper divisors (799575000).

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

399787320 is a wasteful number, since it uses less digits than its factorization.

399787320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331575 (or 3331571 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 399787320 is about 19994.6822930498. The cubic root of 399787320 is about 736.6756899404.

The spelling of 399787320 in words is "three hundred ninety-nine million, seven hundred eighty-seven thousand, three hundred twenty".