391568 has 10 divisors (see below), whose sum is σ = 758694. Its totient is φ = 195776.

The previous prime is 391553. The next prime is 391579. The reversal of 391568 is 865193.

391568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 21904 = 608^2 + 148^2 .

It is a d-powerful number, because it can be written as 3⁶ + 9 + 5⁷ + 1 + 6⁷ + 8⁵ .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12221 + ... + 12252.

2³⁹¹⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

391568 is a deficient number, since it is larger than the sum of its proper divisors (367126).

391568 is a wasteful number, since it uses less digits than its factorization.

391568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24481 (or 24475 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 391568 is about 625.7539452532. The cubic root of 391568 is about 73.1592196234.

It can be divided in two parts, 391 and 568, that added together give a palindrome (959).

The spelling of 391568 in words is "three hundred ninety-one thousand, five hundred sixty-eight".