868391 has 4 divisors (see below), whose sum is σ = 872352. Its totient is φ = 864432.

The previous prime is 868381. The next prime is 868397. The reversal of 868391 is 193868.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 868391 - 2⁶ = 868327 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (218088).

2⁸⁶⁸³⁹¹ is an apocalyptic number.

868391 is a deficient number, since it is larger than the sum of its proper divisors (3961).

868391 is a wasteful number, since it uses less digits than its factorization.

868391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its digits is 10368, while the sum is 35.

The square root of 868391 is about 931.8749916164. The cubic root of 868391 is about 95.4051395807.

The spelling of 868391 in words is "eight hundred sixty-eight thousand, three hundred ninety-one".