865000 has 40 divisors (see below), whose sum is σ = 2038410. Its totient is φ = 344000.

The previous prime is 864989. The next prime is 865001. The reversal of 865000 is 568.

865000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 101124 + 763876 = 318^2 + 874^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (865001) by changing a digit.

865000 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 9 ways as a sum of consecutive naturals, for example, 4914 + ... + 5086.

2⁸⁶⁵⁰⁰⁰ 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 865000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019205).

865000 is an abundant number, since it is smaller than the sum of its proper divisors (1173410).

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

865000 is a wasteful number, since it uses less digits than its factorization.

865000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 865000 is about 930.0537618869. The cubic root of 865000 is about 95.2807943455.

Adding to 865000 its reverse (568), we get a palindrome (865568).

The spelling of 865000 in words is "eight hundred sixty-five thousand".