865863 has 8 divisors (see below), whose sum is σ = 1282800. Its totient is φ = 577224.

The previous prime is 865859. The next prime is 865867. The reversal of 865863 is 368568.

It is an interprime number because it is at equal distance from previous prime (865859) and next prime (865867).

It is not a de Polignac number, because 865863 - 2² = 865859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865867) 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 7 ways as a sum of consecutive naturals, for example, 16008 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (160350).

2⁸⁶⁵⁸⁶³ is an apocalyptic number.

865863 is a deficient number, since it is larger than the sum of its proper divisors (416937).

865863 is a wasteful number, since it uses less digits than its factorization.

865863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32078 (or 32072 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 865863 is about 930.5175978991. The cubic root of 865863 is about 95.3124706441.

It can be divided in two parts, 865 and 863, that added together give a cube (1728 = 12³).

The spelling of 865863 in words is "eight hundred sixty-five thousand, eight hundred sixty-three".