399506628 has 24 divisors (see below), whose sum is σ = 932807232. Its totient is φ = 133079584.

The previous prime is 399506623. The next prime is 399506669. The reversal of 399506628 is 826605993.

It is not an unprimeable number, because it can be changed into a prime (399506621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8926 + ... + 29642.

It is an arithmetic number, because the mean of its divisors is an integer number (38866968).

Almost surely, 2^399506628 is an apocalyptic number.

It is an amenable number.

399506628 is an abundant number, since it is smaller than the sum of its proper divisors (533300604).

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

399506628 is a wasteful number, since it uses less digits than its factorization.

399506628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22331 (or 22329 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 399506628 is about 19987.6618942787. The cubic root of 399506628 is about 736.5032420957.

The spelling of 399506628 in words is "three hundred ninety-nine million, five hundred six thousand, six hundred twenty-eight".