865155 has 16 divisors (see below), whose sum is σ = 1397664. Its totient is φ = 456960.

The previous prime is 865153. The next prime is 865159. The reversal of 865155 is 551568.

It is a happy number.

865155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 865155 - 2¹ = 865153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865153) 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, 1845 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (87354).

2⁸⁶⁵¹⁵⁵ is an apocalyptic number.

865155 is a deficient number, since it is larger than the sum of its proper divisors (532509).

865155 is a wasteful number, since it uses less digits than its factorization.

865155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its digits is 6000, while the sum is 30.

The square root of 865155 is about 930.1370866706. The cubic root of 865155 is about 95.2864851513.

The spelling of 865155 in words is "eight hundred sixty-five thousand, one hundred fifty-five".