25699 has 4 divisors (see below), whose sum is σ = 26560. Its totient is φ = 24840.

The previous prime is 25693. The next prime is 25703. The reversal of 25699 is 99652.

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

It is a cyclic number.

It is not a de Polignac number, because 25699 - 2⁵ = 25667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 829 = 25699 / (2 + 5 + 6 + 9 + 9).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 25699.

It is not an unprimeable number, because it can be changed into a prime (25693) 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 in 3 ways as a sum of consecutive naturals, for example, 384 + ... + 445.

It is an arithmetic number, because the mean of its divisors is an integer number (6640).

2²⁵⁶⁹⁹ is an apocalyptic number.

25699 is a deficient number, since it is larger than the sum of its proper divisors (861).

25699 is an equidigital number, since it uses as much as digits as its factorization.

25699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

The product of its digits is 4860, while the sum is 31.

The square root of 25699 is about 160.3090764742. The cubic root of 25699 is about 29.5101946954.

The spelling of 25699 in words is "twenty-five thousand, six hundred ninety-nine".