391899271872 has 42 divisors (see below), whose sum is σ = 1036923108268. Its totient is φ = 130630199168.

The previous prime is 391899271867. The next prime is 391899271877. The reversal of 391899271872 is 278172998193.

It is an interprime number because it is at equal distance from previous prime (391899271867) and next prime (391899271877).

It is not an unprimeable number, because it can be changed into a prime (391899271877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8651779 + ... + 8696957.

Almost surely, 2^391899271872 is an apocalyptic number.

391899271872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

391899271872 is an abundant number, since it is smaller than the sum of its proper divisors (645023836396).

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

391899271872 is an frugal number, since it uses more digits than its factorization.

391899271872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90373 (or 45184 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 66.

The spelling of 391899271872 in words is "three hundred ninety-one billion, eight hundred ninety-nine million, two hundred seventy-one thousand, eight hundred seventy-two".