25998 has 16 divisors (see below), whose sum is σ = 59520. Its totient is φ = 7416.

The previous prime is 25997. The next prime is 25999. The reversal of 25998 is 89952.

25998 is nontrivially palindromic in base 13.

It is an interprime number because it is at equal distance from previous prime (25997) and next prime (25999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997) 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, 268 + ... + 351.

It is an arithmetic number, because the mean of its divisors is an integer number (3720).

2²⁵⁹⁹⁸ is an apocalyptic number.

25998 is an abundant number, since it is smaller than the sum of its proper divisors (33522).

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 (29760).

25998 is a wasteful number, since it uses less digits than its factorization.

25998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631.

The product of its digits is 6480, while the sum is 33.

The square root of 25998 is about 161.2389531100. The cubic root of 25998 is about 29.6242010502.

The spelling of 25998 in words is "twenty-five thousand, nine hundred ninety-eight".