391974 has 16 divisors (see below), whose sum is σ = 855360. Its totient is φ = 118760.

The previous prime is 391967. The next prime is 391987. The reversal of 391974 is 479193.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 391974.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2904 + ... + 3035.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2³⁹¹⁹⁷⁴ is an apocalyptic number.

391974 is an abundant number, since it is smaller than the sum of its proper divisors (463386).

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

391974 is a wasteful number, since it uses less digits than its factorization.

391974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5955.

The product of its digits is 6804, while the sum is 33.

The square root of 391974 is about 626.0782698673. The cubic root of 391974 is about 73.1844961043.

It can be divided in two parts, 3919 and 74, that added together give a palindrome (3993).

The spelling of 391974 in words is "three hundred ninety-one thousand, nine hundred seventy-four".