265855 has 4 divisors (see below), whose sum is σ = 319032. Its totient is φ = 212680.

The previous prime is 265847. The next prime is 265861. The reversal of 265855 is 558562.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 265855 - 2³ = 265847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26581 + ... + 26590.

It is an arithmetic number, because the mean of its divisors is an integer number (79758).

2²⁶⁵⁸⁵⁵ is an apocalyptic number.

265855 is a deficient number, since it is larger than the sum of its proper divisors (53177).

265855 is an equidigital number, since it uses as much as digits as its factorization.

265855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53176.

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

The square root of 265855 is about 515.6112876965. The cubic root of 265855 is about 64.3005879752.

The spelling of 265855 in words is "two hundred sixty-five thousand, eight hundred fifty-five".