391279012 has 24 divisors (see below), whose sum is σ = 696995712. Its totient is φ = 192158400.

The previous prime is 391278983. The next prime is 391279043. The reversal of 391279012 is 210972193.

It is a happy number.

It is a super-2 number, since 2×391279012² = 306198530463392288, which contains 22 as substring.

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, 77353 + ... + 82255.

It is an arithmetic number, because the mean of its divisors is an integer number (29041488).

Almost surely, 2^391279012 is an apocalyptic number.

It is an amenable number.

391279012 is a deficient number, since it is larger than the sum of its proper divisors (305716700).

391279012 is a wasteful number, since it uses less digits than its factorization.

391279012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259 (or 5257 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 391279012 is about 19780.7737967957. The cubic root of 391279012 is about 731.4121735230.

The spelling of 391279012 in words is "three hundred ninety-one million, two hundred seventy-nine thousand, twelve".