868879 has 4 divisors (see below), whose sum is σ = 947880. Its totient is φ = 789880.

The previous prime is 868877. The next prime is 868883. The reversal of 868879 is 978868.

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 868879 - 2¹ = 868877 is a prime.

It is a Duffinian number.

868879 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868873) 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, 39484 + ... + 39505.

It is an arithmetic number, because the mean of its divisors is an integer number (236970).

2⁸⁶⁸⁸⁷⁹ is an apocalyptic number.

868879 is a deficient number, since it is larger than the sum of its proper divisors (79001).

868879 is a wasteful number, since it uses less digits than its factorization.

868879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79000.

The product of its digits is 193536, while the sum is 46.

The square root of 868879 is about 932.1367925364. The cubic root of 868879 is about 95.4230074880.

The spelling of 868879 in words is "eight hundred sixty-eight thousand, eight hundred seventy-nine".