391368 has 32 divisors (see below), whose sum is σ = 1022400. Its totient is φ = 124608.

The previous prime is 391367. The next prime is 391373. The reversal of 391368 is 863193.

It is a super-2 number, since 2×391368² = 306337822848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (391367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198 + ... + 906.

It is an arithmetic number, because the mean of its divisors is an integer number (31950).

2³⁹¹³⁶⁸ 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 391368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511200).

391368 is an abundant number, since it is smaller than the sum of its proper divisors (631032).

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

391368 is a wasteful number, since it uses less digits than its factorization.

391368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 737 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 391368 is about 625.5941176194. The cubic root of 391368 is about 73.1467617312.

The spelling of 391368 in words is "three hundred ninety-one thousand, three hundred sixty-eight".