399863908 has 6 divisors (see below), whose sum is σ = 699761846. Its totient is φ = 199931952.

The previous prime is 399863903. The next prime is 399863929. The reversal of 399863908 is 809368993.

It can be written as a sum of positive squares in only one way, i.e., 260435044 + 139428864 = 16138^2 + 11808^2 .

It is a super-2 number, since 2×399863908² = 319782289842064928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399863903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49982985 + ... + 49982992.

Almost surely, 2^399863908 is an apocalyptic number.

It is an amenable number.

399863908 is a deficient number, since it is larger than the sum of its proper divisors (299897938).

399863908 is a wasteful number, since it uses less digits than its factorization.

399863908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99965981 (or 99965979 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 399863908 is about 19996.5974105596. The cubic root of 399863908 is about 736.7227290472.

The spelling of 399863908 in words is "three hundred ninety-nine million, eight hundred sixty-three thousand, nine hundred eight".