391560 has 64 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 96000.

The previous prime is 391553. The next prime is 391579. The reversal of 391560 is 65193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 391560.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391560.

It is an unprimeable number.

391560 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 15 ways as a sum of consecutive naturals, for example, 1435 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2³⁹¹⁵⁶⁰ is an apocalyptic number.

391560 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 391560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (635040).

391560 is an abundant number, since it is smaller than the sum of its proper divisors (878520).

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

391560 is a wasteful number, since it uses less digits than its factorization.

391560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 391560 is about 625.7475529317. The cubic root of 391560 is about 73.1587213892.

The spelling of 391560 in words is "three hundred ninety-one thousand, five hundred sixty".