853865 has 4 divisors (see below), whose sum is σ = 1024644. Its totient is φ = 683088.

The previous prime is 853843. The next prime is 853873. The reversal of 853865 is 568358.

853865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 506944 = 589^2 + 712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853865 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85382 + ... + 85391.

It is an arithmetic number, because the mean of its divisors is an integer number (256161).

2⁸⁵³⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

853865 is a deficient number, since it is larger than the sum of its proper divisors (170779).

853865 is a wasteful number, since it uses less digits than its factorization.

853865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170778.

The product of its digits is 28800, while the sum is 35.

The square root of 853865 is about 924.0481589181. The cubic root of 853865 is about 94.8701827968.

The spelling of 853865 in words is "eight hundred fifty-three thousand, eight hundred sixty-five".