25979 has 4 divisors (see below), whose sum is σ = 26376. Its totient is φ = 25584.

The previous prime is 25969. The next prime is 25981. The reversal of 25979 is 97952.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25979 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

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 25979.

It is not an unprimeable number, because it can be changed into a prime (25919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74 + ... + 239.

It is an arithmetic number, because the mean of its divisors is an integer number (6594).

2²⁵⁹⁷⁹ is an apocalyptic number.

25979 is a deficient number, since it is larger than the sum of its proper divisors (397).

25979 is an equidigital number, since it uses as much as digits as its factorization.

25979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its digits is 5670, while the sum is 32.

The square root of 25979 is about 161.1800235761. The cubic root of 25979 is about 29.6169825848.

The spelling of 25979 in words is "twenty-five thousand, nine hundred seventy-nine".