865065 has 16 divisors (see below), whose sum is σ = 1400256. Its totient is φ = 456000.

The previous prime is 865061. The next prime is 865069. The reversal of 865065 is 560568.

865065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (865061) and next prime (865069).

It is not a de Polignac number, because 865065 - 2² = 865061 is a prime.

865065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (865061) 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, 1230 + ... + 1800.

It is an arithmetic number, because the mean of its divisors is an integer number (87516).

2⁸⁶⁵⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

865065 is a deficient number, since it is larger than the sum of its proper divisors (535191).

865065 is a wasteful number, since it uses less digits than its factorization.

865065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 865065 is about 930.0887054470. The cubic root of 865065 is about 95.2831808952.

It can be divided in two parts, 86 and 5065, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 865065 in words is "eight hundred sixty-five thousand, sixty-five".