865005 has 8 divisors (see below), whose sum is σ = 1384032. Its totient is φ = 461328.

The previous prime is 865003. The next prime is 865043. The reversal of 865005 is 500568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 865005 - 2¹ = 865003 is a prime.

865005 is a lucky number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28819 + ... + 28848.

It is an arithmetic number, because the mean of its divisors is an integer number (173004).

2⁸⁶⁵⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

865005 is a deficient number, since it is larger than the sum of its proper divisors (519027).

865005 is a wasteful number, since it uses less digits than its factorization.

865005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57675.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 865005 is about 930.0564498997. The cubic root of 865005 is about 95.2809779304.

The spelling of 865005 in words is "eight hundred sixty-five thousand, five".