25855 has 4 divisors (see below), whose sum is σ = 31032. Its totient is φ = 20680.

The previous prime is 25849. The next prime is 25867. The reversal of 25855 is 55852.

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

It is not a de Polignac number, because 25855 - 2³ = 25847 is a prime.

It is a Duffinian number.

25855 is a lucky 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, 2581 + ... + 2590.

It is an arithmetic number, because the mean of its divisors is an integer number (7758).

2²⁵⁸⁵⁵ is an apocalyptic number.

25855 is a deficient number, since it is larger than the sum of its proper divisors (5177).

25855 is an equidigital number, since it uses as much as digits as its factorization.

25855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176.

The product of its digits is 2000, while the sum is 25.

The square root of 25855 is about 160.7949004166. The cubic root of 25855 is about 29.5697859459.

It can be divided in two parts, 258 and 55, that added together give a palindrome (313).

The spelling of 25855 in words is "twenty-five thousand, eight hundred fifty-five".