391842 has 24 divisors (see below), whose sum is σ = 926640. Its totient is φ = 118680.

The previous prime is 391823. The next prime is 391847. The reversal of 391842 is 248193.

391842 is nontrivially palindromic in base 14.

391842 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391842.

It is not an unprimeable number, because it can be changed into a prime (391847) by changing a digit.

391842 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 11 ways as a sum of consecutive naturals, for example, 792 + ... + 1187.

It is an arithmetic number, because the mean of its divisors is an integer number (38610).

2³⁹¹⁸⁴² is an apocalyptic number.

391842 is an abundant number, since it is smaller than the sum of its proper divisors (534798).

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

391842 is a wasteful number, since it uses less digits than its factorization.

391842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998 (or 1995 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 391842 is about 625.9728428614. The cubic root of 391842 is about 73.1762800508.

It can be divided in two parts, 39 and 1842, that added together give a palindrome (1881).

The spelling of 391842 in words is "three hundred ninety-one thousand, eight hundred forty-two".