25798 has 4 divisors (see below), whose sum is σ = 38700. Its totient is φ = 12898.

The previous prime is 25793. The next prime is 25799. The reversal of 25798 is 89752.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6448 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (9675).

2²⁵⁷⁹⁸ is an apocalyptic number.

25798 is a deficient number, since it is larger than the sum of its proper divisors (12902).

25798 is a wasteful number, since it uses less digits than its factorization.

25798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901.

The product of its digits is 5040, while the sum is 31.

The square root of 25798 is about 160.6175581934. The cubic root of 25798 is about 29.5480400821.

The spelling of 25798 in words is "twenty-five thousand, seven hundred ninety-eight".