864885 has 16 divisors (see below), whose sum is σ = 1581696. Its totient is φ = 395328.

The previous prime is 864883. The next prime is 864887. The reversal of 864885 is 588468.

It is an interprime number because it is at equal distance from previous prime (864883) and next prime (864887).

It is not a de Polignac number, because 864885 - 2¹ = 864883 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864883) 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 15 ways as a sum of consecutive naturals, for example, 4014 + ... + 4223.

It is an arithmetic number, because the mean of its divisors is an integer number (98856).

2⁸⁶⁴⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

864885 is a deficient number, since it is larger than the sum of its proper divisors (716811).

864885 is a wasteful number, since it uses less digits than its factorization.

864885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8252.

The product of its digits is 61440, while the sum is 39.

The square root of 864885 is about 929.9919354489. The cubic root of 864885 is about 95.2765716954.

The spelling of 864885 in words is "eight hundred sixty-four thousand, eight hundred eighty-five".