401878686398 has 16 divisors (see below), whose sum is σ = 690920302464. Its totient is φ = 171737369880.

The previous prime is 401878686397. The next prime is 401878686413. The reversal of 401878686398 is 893686878104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401878686397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41357708 + ... + 41367423.

It is an arithmetic number, because the mean of its divisors is an integer number (43182518904).

Almost surely, 2^401878686398 is an apocalyptic number.

401878686398 is a deficient number, since it is larger than the sum of its proper divisors (289041616066).

401878686398 is a wasteful number, since it uses less digits than its factorization.

401878686398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82725487.

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 401878686398 in words is "four hundred one billion, eight hundred seventy-eight million, six hundred eighty-six thousand, three hundred ninety-eight".