399785808 has 20 divisors (see below), whose sum is σ = 1032780128. Its totient is φ = 133261920.

The previous prime is 399785779. The next prime is 399785819. The reversal of 399785808 is 808587993.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4164388 + ... + 4164483.

Almost surely, 2^399785808 is an apocalyptic number.

It is an amenable number.

399785808 is an abundant number, since it is smaller than the sum of its proper divisors (632994320).

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

399785808 is a wasteful number, since it uses less digits than its factorization.

399785808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8328882 (or 8328876 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The square root of 399785808 is about 19994.6444829609. The cubic root of 399785808 is about 736.6747612341.

The spelling of 399785808 in words is "three hundred ninety-nine million, seven hundred eighty-five thousand, eight hundred eight".