391118 has 24 divisors (see below), whose sum is σ = 737352. Its totient is φ = 154224.

The previous prime is 391117. The next prime is 391133. The reversal of 391118 is 811193.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 391093 and 391102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1121 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (30723).

2³⁹¹¹¹⁸ is an apocalyptic number.

391118 is a deficient number, since it is larger than the sum of its proper divisors (346234).

391118 is a wasteful number, since it uses less digits than its factorization.

391118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 329 counting only the distinct ones).

The product of its digits is 216, while the sum is 23.

The square root of 391118 is about 625.3942756374. The cubic root of 391118 is about 73.1311833961.

The spelling of 391118 in words is "three hundred ninety-one thousand, one hundred eighteen".