399426724 has 12 divisors (see below), whose sum is σ = 699211548. Its totient is φ = 199652000.

The previous prime is 399426707. The next prime is 399426739. The reversal of 399426724 is 427624993.

It can be written as a sum of positive squares in 2 ways, for example, as 96040000 + 303386724 = 9800^2 + 17418^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314 + ... + 28294.

It is an arithmetic number, because the mean of its divisors is an integer number (58267629).

Almost surely, 2^399426724 is an apocalyptic number.

It is an amenable number.

399426724 is a deficient number, since it is larger than the sum of its proper divisors (299784824).

399426724 is a wasteful number, since it uses less digits than its factorization.

399426724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30686 (or 30684 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 399426724 is about 19985.6629612330. The cubic root of 399426724 is about 736.4541369622.

The spelling of 399426724 in words is "three hundred ninety-nine million, four hundred twenty-six thousand, seven hundred twenty-four".