391158 has 24 divisors (see below), whose sum is σ = 876096. Its totient is φ = 126000.

The previous prime is 391151. The next prime is 391159. The reversal of 391158 is 851193.

391158 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391151) 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, 208 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (36504).

2³⁹¹¹⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438048).

391158 is an abundant number, since it is smaller than the sum of its proper divisors (484938).

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

391158 is a wasteful number, since it uses less digits than its factorization.

391158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 737 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 391158 is about 625.4262546456. The cubic root of 391158 is about 73.1336763757.

It can be divided in two parts, 3911 and 58, that added together give a square (3969 = 63²).

The spelling of 391158 in words is "three hundred ninety-one thousand, one hundred fifty-eight".