391040691912 has 144 divisors (see below), whose sum is σ = 1207160744400. Its totient is φ = 113987502720.

The previous prime is 391040691869. The next prime is 391040691949. The reversal of 391040691912 is 219196040193.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 614514 + ... + 1076897.

It is an arithmetic number, because the mean of its divisors is an integer number (8383060725).

Almost surely, 2^391040691912 is an apocalyptic number.

It is an amenable number.

391040691912 is an abundant number, since it is smaller than the sum of its proper divisors (816120052488).

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

391040691912 is a wasteful number, since it uses less digits than its factorization.

391040691912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691468 (or 1691448 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 391040691912 in words is "three hundred ninety-one billion, forty million, six hundred ninety-one thousand, nine hundred twelve".