391992 has 16 divisors (see below), whose sum is σ = 980040. Its totient is φ = 130656.

The previous prime is 391987. The next prime is 391999. The reversal of 391992 is 299193.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391992.

It is not an unprimeable number, because it can be changed into a prime (391999) by changing a digit.

391992 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, 8143 + ... + 8190.

2³⁹¹⁹⁹² is an apocalyptic number.

It is an amenable number.

391992 is an abundant number, since it is smaller than the sum of its proper divisors (588048).

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

391992 is a wasteful number, since it uses less digits than its factorization.

391992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16342 (or 16338 counting only the distinct ones).

The product of its digits is 4374, while the sum is 33.

The square root of 391992 is about 626.0926449017. The cubic root of 391992 is about 73.1856163324.

The spelling of 391992 in words is "three hundred ninety-one thousand, nine hundred ninety-two".