399802656 has 48 divisors (see below), whose sum is σ = 1144892448. Its totient is φ = 121152000.

The previous prime is 399802639. The next prime is 399802657. The reversal of 399802656 is 656208993.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (399802657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188245 + ... + 190356.

It is an arithmetic number, because the mean of its divisors is an integer number (23851926).

Almost surely, 2^399802656 is an apocalyptic number.

It is an amenable number.

399802656 is an abundant number, since it is smaller than the sum of its proper divisors (745089792).

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

399802656 is a wasteful number, since it uses less digits than its factorization.

399802656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378625 (or 378617 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 399802656 is about 19995.0657913396. The cubic root of 399802656 is about 736.6851095438.

The spelling of 399802656 in words is "three hundred ninety-nine million, eight hundred two thousand, six hundred fifty-six".