400541556 has 48 divisors (see below), whose sum is σ = 991497024. Its totient is φ = 125415936.

The previous prime is 400541521. The next prime is 400541621. The reversal of 400541556 is 655145004.

It is a super-2 number, since 2×400541556² = 320867076165802272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123451 + ... + 126653.

It is an arithmetic number, because the mean of its divisors is an integer number (20656188).

Almost surely, 2^400541556 is an apocalyptic number.

It is an amenable number.

400541556 is an abundant number, since it is smaller than the sum of its proper divisors (590955468).

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

400541556 is a wasteful number, since it uses less digits than its factorization.

400541556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840 (or 3838 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 400541556 is about 20013.5343205542. The cubic root of 400541556 is about 737.1386680035.

The spelling of 400541556 in words is "four hundred million, five hundred forty-one thousand, five hundred fifty-six".