865944 has 64 divisors (see below), whose sum is σ = 2544000. Its totient is φ = 272160.

The previous prime is 865937. The next prime is 865957. The reversal of 865944 is 449568.

865944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×865944² = 1499718022272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 865899 and 865908.

It is a congruent number.

It is an unprimeable number.

865944 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3999 + ... + 4209.

It is an arithmetic number, because the mean of its divisors is an integer number (39750).

2⁸⁶⁵⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272000).

865944 is an abundant number, since it is smaller than the sum of its proper divisors (1678056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865944 is a wasteful number, since it uses less digits than its factorization.

865944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 235 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 865944 is about 930.5611210447. The cubic root of 865944 is about 95.3154426575.

The spelling of 865944 in words is "eight hundred sixty-five thousand, nine hundred forty-four".