868815 has 24 divisors (see below), whose sum is σ = 1544400. Its totient is φ = 451584.

The previous prime is 868801. The next prime is 868817. The reversal of 868815 is 518868.

It is not a de Polignac number, because 868815 - 2⁴ = 868799 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 868815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1711 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (64350).

2⁸⁶⁸⁸¹⁵ is an apocalyptic number.

868815 is a deficient number, since it is larger than the sum of its proper divisors (675585).

868815 is a wasteful number, since it uses less digits than its factorization.

868815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 868815 is about 932.1024621789. The cubic root of 868815 is about 95.4206645372.

The spelling of 868815 in words is "eight hundred sixty-eight thousand, eight hundred fifteen".