25839 has 20 divisors (see below), whose sum is σ = 43560. Its totient is φ = 15120.

The previous prime is 25819. The next prime is 25841. The reversal of 25839 is 93852.

It is not a de Polignac number, because 25839 - 2⁸ = 25583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25819) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 877 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (2178).

2²⁵⁸³⁹ is an apocalyptic number.

25839 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25839 is a deficient number, since it is larger than the sum of its proper divisors (17721).

25839 is a wasteful number, since it uses less digits than its factorization.

With its successor (25840) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (43).

25839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 43 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 25839 is about 160.7451398954. The cubic root of 25839 is about 29.5636850730.

The spelling of 25839 in words is "twenty-five thousand, eight hundred thirty-nine".