400478556 has 12 divisors (see below), whose sum is σ = 934449992. Its totient is φ = 133492848.

The previous prime is 400478549. The next prime is 400478563. The reversal of 400478556 is 655874004.

It is an interprime number because it is at equal distance from previous prime (400478549) and next prime (400478563).

It is a tau number, because it is divible by the number of its divisors (12).

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, 16686595 + ... + 16686618.

Almost surely, 2^400478556 is an apocalyptic number.

It is an amenable number.

400478556 is an abundant number, since it is smaller than the sum of its proper divisors (533971436).

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

400478556 is a wasteful number, since it uses less digits than its factorization.

400478556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33373220 (or 33373218 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 400478556 is about 20011.9603237664. The cubic root of 400478556 is about 737.1000185214.

The spelling of 400478556 in words is "four hundred million, four hundred seventy-eight thousand, five hundred fifty-six".