400844556 has 36 divisors (see below), whose sum is σ = 1157996112. Its totient is φ = 114526944.

The previous prime is 400844497. The next prime is 400844573. The reversal of 400844556 is 655448004.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 400844556.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 795075 + ... + 795578.

Almost surely, 2^400844556 is an apocalyptic number.

It is an amenable number.

400844556 is an abundant number, since it is smaller than the sum of its proper divisors (757151556).

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

400844556 is a wasteful number, since it uses less digits than its factorization.

400844556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590670 (or 1590665 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 400844556 is about 20021.1027668308. The cubic root of 400844556 is about 737.3244970112.

The spelling of 400844556 in words is "four hundred million, eight hundred forty-four thousand, five hundred fifty-six".