868859 has 4 divisors (see below), whose sum is σ = 873600. Its totient is φ = 864120.

The previous prime is 868849. The next prime is 868867. The reversal of 868859 is 958868.

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 868859 - 2⁸ = 868603 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (868849) 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, 2084 + ... + 2465.

It is an arithmetic number, because the mean of its divisors is an integer number (218400).

2⁸⁶⁸⁸⁵⁹ is an apocalyptic number.

868859 is a deficient number, since it is larger than the sum of its proper divisors (4741).

868859 is a wasteful number, since it uses less digits than its factorization.

868859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740.

The product of its digits is 138240, while the sum is 44.

The square root of 868859 is about 932.1260644355. The cubic root of 868859 is about 95.4222753282.

Subtracting 868859 from its reverse (958868), we obtain a palindrome (90009).

The spelling of 868859 in words is "eight hundred sixty-eight thousand, eight hundred fifty-nine".