401878205976 has 64 divisors (see below), whose sum is σ = 1116882385920. Its totient is φ = 119665964160.

The previous prime is 401878205933. The next prime is 401878206011. The reversal of 401878205976 is 679502878104.

It is a super-2 number, since 2×401878205976² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 20765670 + ... + 20785013.

It is an arithmetic number, because the mean of its divisors is an integer number (17451287280).

Almost surely, 2^401878205976 is an apocalyptic number.

It is an amenable number.

401878205976 is an abundant number, since it is smaller than the sum of its proper divisors (715004179944).

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

401878205976 is a wasteful number, since it uses less digits than its factorization.

401878205976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41550736 (or 41550732 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 401878205976 in words is "four hundred one billion, eight hundred seventy-eight million, two hundred five thousand, nine hundred seventy-six".