391168 has 24 divisors (see below), whose sum is σ = 786240. Its totient is φ = 194560.

The previous prime is 391163. The next prime is 391177. The reversal of 391168 is 861193.

It is a happy number.

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 (391163) by changing a digit.

391168 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1953 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2³⁹¹¹⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393120).

391168 is an abundant number, since it is smaller than the sum of its proper divisors (395072).

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

391168 is an equidigital number, since it uses as much as digits as its factorization.

391168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 193 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 391168 is about 625.4342491421. The cubic root of 391168 is about 73.1342995941.

The spelling of 391168 in words is "three hundred ninety-one thousand, one hundred sixty-eight".