391886 has 16 divisors (see below), whose sum is σ = 656640. Its totient is φ = 173880.

The previous prime is 391879. The next prime is 391889. The reversal of 391886 is 688193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391889) by changing a digit.

391886 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2³⁹¹⁸⁸⁶ is an apocalyptic number.

391886 is a deficient number, since it is larger than the sum of its proper divisors (264754).

391886 is a wasteful number, since it uses less digits than its factorization.

391886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its digits is 10368, while the sum is 35.

The square root of 391886 is about 626.0079871695. The cubic root of 391886 is about 73.1790189403.

It can be divided in two parts, 3918 and 86, that added together give a palindrome (4004).

The spelling of 391886 in words is "three hundred ninety-one thousand, eight hundred eighty-six".