25986 has 16 divisors (see below), whose sum is σ = 53568. Its totient is φ = 8400.

The previous prime is 25981. The next prime is 25997. The reversal of 25986 is 68952.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331 + ... + 401.

It is an arithmetic number, because the mean of its divisors is an integer number (3348).

2²⁵⁹⁸⁶ is an apocalyptic number.

25986 is an abundant number, since it is smaller than the sum of its proper divisors (27582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784).

25986 is a wasteful number, since it uses less digits than its factorization.

25986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137.

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

The square root of 25986 is about 161.2017369633. The cubic root of 25986 is about 29.6196424288.

The spelling of 25986 in words is "twenty-five thousand, nine hundred eighty-six".