401959566 has 24 divisors (see below), whose sum is σ = 885675960. Its totient is φ = 131715216.

The previous prime is 401959559. The next prime is 401959583. The reversal of 401959566 is 665959104.

It is a happy number.

401959566 is a `hidden beast` number, since 40 + 19 + 595 + 6 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188185 + ... + 190308.

It is an arithmetic number, because the mean of its divisors is an integer number (36903165).

Almost surely, 2^401959566 is an apocalyptic number.

401959566 is an abundant number, since it is smaller than the sum of its proper divisors (483716394).

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

401959566 is a wasteful number, since it uses less digits than its factorization.

401959566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378560 (or 378557 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 401959566 is about 20048.9292980947. The cubic root of 401959566 is about 738.0075241042.

The spelling of 401959566 in words is "four hundred one million, nine hundred fifty-nine thousand, five hundred sixty-six".