391172 has 12 divisors (see below), whose sum is σ = 720720. Its totient is φ = 185256.

The previous prime is 391163. The next prime is 391177. The reversal of 391172 is 271193.

It is not an unprimeable number, because it can be changed into a prime (391177) by changing a digit.

391172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2498 + ... + 2649.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

2³⁹¹¹⁷² is an apocalyptic number.

It is an amenable number.

391172 is a deficient number, since it is larger than the sum of its proper divisors (329548).

391172 is a wasteful number, since it uses less digits than its factorization.

391172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5170 (or 5168 counting only the distinct ones).

The product of its digits is 378, while the sum is 23.

The square root of 391172 is about 625.4374469122. The cubic root of 391172 is about 73.1345488784.

The spelling of 391172 in words is "three hundred ninety-one thousand, one hundred seventy-two".