865245 has 16 divisors (see below), whose sum is σ = 1422720. Its totient is φ = 448704.

The previous prime is 865231. The next prime is 865247. The reversal of 865245 is 542568.

It is not a de Polignac number, because 865245 - 2⁵ = 865213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2⁸⁶⁵²⁴⁵ is an apocalyptic number.

It is an amenable number.

865245 is a deficient number, since it is larger than the sum of its proper divisors (557475).

865245 is a wasteful number, since it uses less digits than its factorization.

865245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604.

The product of its digits is 9600, while the sum is 30.

The square root of 865245 is about 930.1854653777. The cubic root of 865245 is about 95.2897891782.

The spelling of 865245 in words is "eight hundred sixty-five thousand, two hundred forty-five".