391860 has 72 divisors (see below), whose sum is σ = 1362816. Its totient is φ = 89280.

The previous prime is 391847. The next prime is 391861. The reversal of 391860 is 68193.

391860 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 congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391860.

It is not an unprimeable number, because it can be changed into a prime (391861) by changing a digit.

391860 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1105 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (18928).

2³⁹¹⁸⁶⁰ is an apocalyptic number.

391860 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681408).

391860 is an abundant number, since it is smaller than the sum of its proper divisors (970956).

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

391860 is a wasteful number, since it uses less digits than its factorization.

391860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 328 counting only the distinct ones).

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

The square root of 391860 is about 625.9872203168. The cubic root of 391860 is about 73.1774005304.

The spelling of 391860 in words is "three hundred ninety-one thousand, eight hundred sixty".