391086 has 12 divisors (see below), whose sum is σ = 847392. Its totient is φ = 130356.

The previous prime is 391073. The next prime is 391103. The reversal of 391086 is 680193.

391086 is nontrivially palindromic in base 7.

391086 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10846 + ... + 10881.

It is an arithmetic number, because the mean of its divisors is an integer number (70616).

2³⁹¹⁰⁸⁶ is an apocalyptic number.

391086 is an abundant number, since it is smaller than the sum of its proper divisors (456306).

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

391086 is a wasteful number, since it uses less digits than its factorization.

391086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21735 (or 21732 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 391086 is about 625.3686912534. The cubic root of 391086 is about 73.1291888900.

The spelling of 391086 in words is "three hundred ninety-one thousand, eighty-six".