25598 has 4 divisors (see below), whose sum is σ = 38400. Its totient is φ = 12798.

The previous prime is 25589. The next prime is 25601. The reversal of 25598 is 89552.

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

It is a Curzon number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 25598.

It is a congruent number.

It is an unprimeable number.

25598 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6398 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (9600).

2²⁵⁵⁹⁸ is an apocalyptic number.

25598 is a deficient number, since it is larger than the sum of its proper divisors (12802).

25598 is a wasteful number, since it uses less digits than its factorization.

25598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12801.

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

The square root of 25598 is about 159.9937498779. The cubic root of 25598 is about 29.4714844626.

It can be divided in two parts, 255 and 98, that added together give a palindrome (353).

The spelling of 25598 in words is "twenty-five thousand, five hundred ninety-eight".