844865 has 16 divisors (see below), whose sum is σ = 1175040. Its totient is φ = 571200.

The previous prime is 844861. The next prime is 844867. The reversal of 844865 is 568448.

It is not a de Polignac number, because 844865 - 2² = 844861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3416 + ... + 3654.

It is an arithmetic number, because the mean of its divisors is an integer number (73440).

2⁸⁴⁴⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

844865 is a deficient number, since it is larger than the sum of its proper divisors (330175).

844865 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (844864) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (352).

844865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its digits is 30720, while the sum is 35.

The square root of 844865 is about 919.1653822898. The cubic root of 844865 is about 94.5356844788.

The spelling of 844865 in words is "eight hundred forty-four thousand, eight hundred sixty-five".