391972 has 12 divisors (see below), whose sum is σ = 784000. Its totient is φ = 167976.

The previous prime is 391967. The next prime is 391987. The reversal of 391972 is 279193.

391972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

391972 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6972 + ... + 7027.

2³⁹¹⁹⁷² is an apocalyptic number.

It is an amenable number.

391972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

391972 is a wasteful number, since it uses less digits than its factorization.

391972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14010 (or 14008 counting only the distinct ones).

The product of its digits is 3402, while the sum is 31.

The square root of 391972 is about 626.0766726209. The cubic root of 391972 is about 73.1843716324.

The spelling of 391972 in words is "three hundred ninety-one thousand, nine hundred seventy-two".