401939177856 has 48 divisors (see below), whose sum is σ = 1067683942260. Its totient is φ = 133975584768.

The previous prime is 401939177839. The next prime is 401939177897. The reversal of 401939177856 is 658771939104.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 401939177856.

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, 12407376 + ... + 12439728.

Almost surely, 2^401939177856 is an apocalyptic number.

It is an amenable number.

401939177856 is an abundant number, since it is smaller than the sum of its proper divisors (665744764404).

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

401939177856 is an frugal number, since it uses more digits than its factorization.

401939177856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64723 (or 32358 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 60.

The spelling of 401939177856 in words is "four hundred one billion, nine hundred thirty-nine million, one hundred seventy-seven thousand, eight hundred fifty-six".