865895 has 16 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 637440.

The previous prime is 865889. The next prime is 865933. The reversal of 865895 is 598568.

It is not a de Polignac number, because 865895 - 2⁸ = 865639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5102 + ... + 5268.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁸⁶⁵⁸⁹⁵ is an apocalyptic number.

865895 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

865895 is a deficient number, since it is larger than the sum of its proper divisors (259033).

865895 is a wasteful number, since it uses less digits than its factorization.

865895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250.

The product of its digits is 86400, while the sum is 41.

The square root of 865895 is about 930.5347924715. The cubic root of 865895 is about 95.3136447950.

The spelling of 865895 in words is "eight hundred sixty-five thousand, eight hundred ninety-five".