845865 has 12 divisors (see below), whose sum is σ = 1466244. Its totient is φ = 451104.

The previous prime is 845863. The next prime is 845879. The reversal of 845865 is 568548.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 514089 + 331776 = 717^2 + 576^2 .

It is not a de Polignac number, because 845865 - 2¹ = 845863 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 845865.

It is not an unprimeable number, because it can be changed into a prime (845863) 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, 9354 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (122187).

2⁸⁴⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

845865 is a deficient number, since it is larger than the sum of its proper divisors (620379).

845865 is a wasteful number, since it uses less digits than its factorization.

845865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18808 (or 18805 counting only the distinct ones).

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

The square root of 845865 is about 919.7091931692. The cubic root of 845865 is about 94.5729679150.

The spelling of 845865 in words is "eight hundred forty-five thousand, eight hundred sixty-five".