25869 has 4 divisors (see below), whose sum is σ = 34496. Its totient is φ = 17244.

The previous prime is 25867. The next prime is 25873. The reversal of 25869 is 96852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25869 - 2¹ = 25867 is a prime.

It is a super-2 number, since 2×25869² = 1338410322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25869.

It is not an unprimeable number, because it can be changed into a prime (25867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4309 + ... + 4314.

It is an arithmetic number, because the mean of its divisors is an integer number (8624).

2²⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

25869 is a deficient number, since it is larger than the sum of its proper divisors (8627).

25869 is an equidigital number, since it uses as much as digits as its factorization.

25869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8626.

The product of its digits is 4320, while the sum is 30.

The square root of 25869 is about 160.8384282440. The cubic root of 25869 is about 29.5751221453.

The spelling of 25869 in words is "twenty-five thousand, eight hundred sixty-nine".