401558994 has 24 divisors (see below), whose sum is σ = 872229852. Its totient is φ = 133516800.

The previous prime is 401558987. The next prime is 401559013. The reversal of 401558994 is 499855104.

401558994 is a `hidden beast` number, since 4 + 0 + 1 + 558 + 9 + 94 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 396209025 + 5349969 = 19905^2 + 2313^2 .

It is a super-2 number, since 2×401558994² = 322499251324584072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20599 + ... + 35034.

Almost surely, 2^401558994 is an apocalyptic number.

401558994 is an abundant number, since it is smaller than the sum of its proper divisors (470670858).

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

401558994 is a wasteful number, since it uses less digits than its factorization.

401558994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56042 (or 56039 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 401558994 is about 20038.9369478523. The cubic root of 401558994 is about 737.7622893170.

The spelling of 401558994 in words is "four hundred one million, five hundred fifty-eight thousand, nine hundred ninety-four".