400978402 has 16 divisors (see below), whose sum is σ = 656460000. Its totient is φ = 182175840.

The previous prime is 400978399. The next prime is 400978421. The reversal of 400978402 is 204879004.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74374 + ... + 79582.

It is an arithmetic number, because the mean of its divisors is an integer number (41028750).

Almost surely, 2^400978402 is an apocalyptic number.

400978402 is a deficient number, since it is larger than the sum of its proper divisors (255481598).

400978402 is a wasteful number, since it uses less digits than its factorization.

400978402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8721.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 400978402 is about 20024.4451109138. The cubic root of 400978402 is about 737.4065545494.

The spelling of 400978402 in words is "four hundred million, nine hundred seventy-eight thousand, four hundred two".