401686791 has 8 divisors (see below), whose sum is σ = 584271744. Its totient is φ = 243446520.

The previous prime is 401686783. The next prime is 401686793. The reversal of 401686791 is 197686104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 401686791 - 2³ = 401686783 is a prime.

It is a super-2 number, since 2×401686791² = 322704556127755362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401686793) 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, 6086131 + ... + 6086196.

It is an arithmetic number, because the mean of its divisors is an integer number (73033968).

Almost surely, 2^401686791 is an apocalyptic number.

401686791 is a deficient number, since it is larger than the sum of its proper divisors (182584953).

401686791 is a wasteful number, since it uses less digits than its factorization.

401686791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172341.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 401686791 is about 20042.1254112432. The cubic root of 401686791 is about 737.8405458193.

The spelling of 401686791 in words is "four hundred one million, six hundred eighty-six thousand, seven hundred ninety-one".