865255 has 8 divisors (see below), whose sum is σ = 1047024. Its totient is φ = 686400.

The previous prime is 865253. The next prime is 865259. The reversal of 865255 is 552568.

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

It is not a de Polignac number, because 865255 - 2¹ = 865253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (130878).

2⁸⁶⁵²⁵⁵ is an apocalyptic number.

865255 is a deficient number, since it is larger than the sum of its proper divisors (181769).

865255 is a wasteful number, since it uses less digits than its factorization.

865255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457.

The product of its digits is 12000, while the sum is 31.

The square root of 865255 is about 930.1908406343. The cubic root of 865255 is about 95.2901562782.

The spelling of 865255 in words is "eight hundred sixty-five thousand, two hundred fifty-five".