399504408 has 32 divisors (see below), whose sum is σ = 1006632960. Its totient is φ = 132118560.

The previous prime is 399504379. The next prime is 399504421. The reversal of 399504408 is 804405993.

It is a super-2 number, since 2×399504408² = 319207544022860928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399504408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62488 + ... + 68583.

It is an arithmetic number, because the mean of its divisors is an integer number (31457280).

Almost surely, 2^399504408 is an apocalyptic number.

It is an amenable number.

399504408 is an abundant number, since it is smaller than the sum of its proper divisors (607128552).

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

399504408 is a wasteful number, since it uses less digits than its factorization.

399504408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131207 (or 131203 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 399504408 is about 19987.6063599422. The cubic root of 399504408 is about 736.5018778795.

The spelling of 399504408 in words is "three hundred ninety-nine million, five hundred four thousand, four hundred eight".