865287 has 12 divisors (see below), whose sum is σ = 1266720. Its totient is φ = 569088.

The previous prime is 865261. The next prime is 865301. The reversal of 865287 is 782568.

It is not a de Polignac number, because 865287 - 2⁷ = 865159 is a prime.

865287 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (105560).

2⁸⁶⁵²⁸⁷ is an apocalyptic number.

865287 is a deficient number, since it is larger than the sum of its proper divisors (401433).

865287 is a wasteful number, since it uses less digits than its factorization.

865287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302 (or 1299 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 865287 is about 930.2080412467. The cubic root of 865287 is about 95.2913309791.

The spelling of 865287 in words is "eight hundred sixty-five thousand, two hundred eighty-seven".