401633556 has 12 divisors (see below), whose sum is σ = 937144992. Its totient is φ = 133877848.

The previous prime is 401633539. The next prime is 401633569. The reversal of 401633556 is 655336104.

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

It is a super-2 number, since 2×401633556² = 322619026610410272, 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 3 ways as a sum of consecutive naturals, for example, 16734720 + ... + 16734743.

It is an arithmetic number, because the mean of its divisors is an integer number (78095416).

Almost surely, 2^401633556 is an apocalyptic number.

It is an amenable number.

401633556 is an abundant number, since it is smaller than the sum of its proper divisors (535511436).

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

401633556 is a wasteful number, since it uses less digits than its factorization.

401633556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33469470 (or 33469468 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 401633556 is about 20040.7972895292. The cubic root of 401633556 is about 737.8079493805.

The spelling of 401633556 in words is "four hundred one million, six hundred thirty-three thousand, five hundred fifty-six".