399824708 has 6 divisors (see below), whose sum is σ = 699693246. Its totient is φ = 199912352.

The previous prime is 399824681. The next prime is 399824729. The reversal of 399824708 is 807428993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 303038464 + 96786244 = 17408^2 + 9838^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49978085 + ... + 49978092.

It is an arithmetic number, because the mean of its divisors is an integer number (116615541).

Almost surely, 2^399824708 is an apocalyptic number.

It is an amenable number.

399824708 is a deficient number, since it is larger than the sum of its proper divisors (299868538).

399824708 is a wasteful number, since it uses less digits than its factorization.

399824708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99956181 (or 99956179 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 399824708 is about 19995.6172197809. The cubic root of 399824708 is about 736.6986537937.

The spelling of 399824708 in words is "three hundred ninety-nine million, eight hundred twenty-four thousand, seven hundred eight".