401985402378 has 48 divisors (see below), whose sum is σ = 938787537600. Its totient is φ = 114416246784.

The previous prime is 401985402337. The next prime is 401985402383. The reversal of 401985402378 is 873204589104.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 401985402378.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2522103 + ... + 2676746.

It is an arithmetic number, because the mean of its divisors is an integer number (19558073700).

Almost surely, 2^401985402378 is an apocalyptic number.

401985402378 is an abundant number, since it is smaller than the sum of its proper divisors (536802135222).

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

401985402378 is a wasteful number, since it uses less digits than its factorization.

401985402378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199131 (or 5199124 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 401985402378 in words is "four hundred one billion, nine hundred eighty-five million, four hundred two thousand, three hundred seventy-eight".