399409808 has 40 divisors (see below), whose sum is σ = 914911680. Its totient is φ = 165271680.

The previous prime is 399409799. The next prime is 399409831. The reversal of 399409808 is 808904993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58238 + ... + 64733.

It is an arithmetic number, because the mean of its divisors is an integer number (22872792).

Almost surely, 2^399409808 is an apocalyptic number.

It is an amenable number.

399409808 is an abundant number, since it is smaller than the sum of its proper divisors (515501872).

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

399409808 is a wasteful number, since it uses less digits than its factorization.

399409808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123015 (or 123009 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 399409808 is about 19985.2397533780. The cubic root of 399409808 is about 736.4437403668.

The spelling of 399409808 in words is "three hundred ninety-nine million, four hundred nine thousand, eight hundred eight".