401865588 has 18 divisors (see below), whose sum is σ = 1015826994. Its totient is φ = 133955184.

The previous prime is 401865577. The next prime is 401865631. The reversal of 401865588 is 885568104.

401865588 is a `hidden beast` number, since 4 + 0 + 1 + 8 + 65 + 588 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217503504 + 184362084 = 14748^2 + 13578^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×401865588² = 322991901637171488, 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 5 ways as a sum of consecutive naturals, for example, 5581431 + ... + 5581502.

It is an arithmetic number, because the mean of its divisors is an integer number (56434833).

Almost surely, 2^401865588 is an apocalyptic number.

It is an amenable number.

401865588 is an abundant number, since it is smaller than the sum of its proper divisors (613961406).

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

401865588 is a wasteful number, since it uses less digits than its factorization.

401865588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11162943 (or 11162938 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 401865588 is about 20046.5854449081. The cubic root of 401865588 is about 737.9500043246.

The spelling of 401865588 in words is "four hundred one million, eight hundred sixty-five thousand, five hundred eighty-eight".