391325979 has 32 divisors (see below), whose sum is σ = 598998528. Its totient is φ = 226802400.

The previous prime is 391325959. The next prime is 391325983. The reversal of 391325979 is 979523193.

It is not a de Polignac number, because 391325979 - 2¹² = 391321883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391325959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89709 + ... + 93969.

It is an arithmetic number, because the mean of its divisors is an integer number (18718704).

Almost surely, 2^391325979 is an apocalyptic number.

391325979 is a deficient number, since it is larger than the sum of its proper divisors (207672549).

391325979 is a wasteful number, since it uses less digits than its factorization.

391325979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4320 (or 4298 counting only the distinct ones).

The product of its digits is 459270, while the sum is 48.

The square root of 391325979 is about 19781.9609493093. The cubic root of 391325979 is about 731.4414372624.

It can be divided in two parts, 3913 and 25979, that added together give a palindrome (29892).

The spelling of 391325979 in words is "three hundred ninety-one million, three hundred twenty-five thousand, nine hundred seventy-nine".