865825 has 12 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 679760.

The previous prime is 865819. The next prime is 865829. The reversal of 865825 is 528568.

It is not a de Polignac number, because 865825 - 2³ = 865817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865829) 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, 1182 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (91140).

2⁸⁶⁵⁸²⁵ is an apocalyptic number.

It is an amenable number.

865825 is a deficient number, since it is larger than the sum of its proper divisors (227855).

865825 is a wasteful number, since it uses less digits than its factorization.

865825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 651 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 865825 is about 930.4971789318. The cubic root of 865825 is about 95.3110763023.

The spelling of 865825 in words is "eight hundred sixty-five thousand, eight hundred twenty-five".