865845 has 24 divisors (see below), whose sum is σ = 1527552. Its totient is φ = 453600.

The previous prime is 865829. The next prime is 865847. The reversal of 865845 is 548568.

It is a happy number.

865845 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 865845 - 2⁴ = 865829 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865845.

It is not an unprimeable number, because it can be changed into a prime (865847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3060 + ... + 3330.

It is an arithmetic number, because the mean of its divisors is an integer number (63648).

2⁸⁶⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

865845 is a deficient number, since it is larger than the sum of its proper divisors (661707).

865845 is a wasteful number, since it uses less digits than its factorization.

865845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 350 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 865845 is about 930.5079258126. The cubic root of 865845 is about 95.3118101715.

The spelling of 865845 in words is "eight hundred sixty-five thousand, eight hundred forty-five".