391912402 has 16 divisors (see below), whose sum is σ = 673729920. Its totient is φ = 167492448.

The previous prime is 391912393. The next prime is 391912453. The reversal of 391912402 is 204219193.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33963 + ... + 44014.

It is an arithmetic number, because the mean of its divisors is an integer number (42108120).

Almost surely, 2^391912402 is an apocalyptic number.

391912402 is a deficient number, since it is larger than the sum of its proper divisors (281817518).

391912402 is a wasteful number, since it uses less digits than its factorization.

391912402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78345.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 391912402 is about 19796.7775660586. Note that the first 3 decimals coincide. The cubic root of 391912402 is about 731.8066230009.

The spelling of 391912402 in words is "three hundred ninety-one million, nine hundred twelve thousand, four hundred two".