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25985 = 55197

25985 has 4 divisors (see below), whose sum is σ = 31188. Its totient is φ = 20784.

The previous prime is 25981. The next prime is 25997. The reversal of 25985 is 58952.

25985 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10609 + 15376 = 103^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 25985 - 22 = 25981 is a prime.

It is a Duffinian number.

25985 is strictly pandigital in base 6.

It is a Curzon number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2594 + ... + 2603.

It is an arithmetic number, because the mean of its divisors is an integer number (7797).

225985 is an apocalyptic number.

It is an amenable number.

25985 is a deficient number, since it is larger than the sum of its proper divisors (5203).

25985 is an equidigital number, since it uses as much as digits as its factorization.

25985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5202.

The product of its digits is 3600, while the sum is 29.

The square root of 25985 is about 161.1986352300. The cubic root of 25985 is about 29.6192624803.

The spelling of 25985 in words is "twenty-five thousand, nine hundred eighty-five".

Divisors: 1 5 5197 25985