399409604 has 12 divisors (see below), whose sum is σ = 762509328. Its totient is φ = 181549800.

The previous prime is 399409603. The next prime is 399409607. The reversal of 399409604 is 406904993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 9077491 = 399409604 / (3 + 9 + 9 + 4 + 0 + 9 + 6 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (399409601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4538702 + ... + 4538789.

It is an arithmetic number, because the mean of its divisors is an integer number (63542444).

Almost surely, 2^399409604 is an apocalyptic number.

It is an amenable number.

399409604 is a deficient number, since it is larger than the sum of its proper divisors (363099724).

399409604 is a wasteful number, since it uses less digits than its factorization.

399409604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9077506 (or 9077504 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 399409604 is about 19985.2346496107. The cubic root of 399409604 is about 736.4436149864.

The spelling of 399409604 in words is "three hundred ninety-nine million, four hundred nine thousand, six hundred four".