400515556 has 12 divisors (see below), whose sum is σ = 801031168. Its totient is φ = 171649512.

The previous prime is 400515551. The next prime is 400515637. The reversal of 400515556 is 655515004.

400515556 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (400515551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7152036 + ... + 7152091.

Almost surely, 2^400515556 is an apocalyptic number.

It is an amenable number.

400515556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400515556 is a wasteful number, since it uses less digits than its factorization.

400515556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14304138 (or 14304136 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 400515556 is about 20012.8847495807. The cubic root of 400515556 is about 737.1227179148.

The spelling of 400515556 in words is "four hundred million, five hundred fifteen thousand, five hundred fifty-six".