25729 has 4 divisors (see below), whose sum is σ = 28080. Its totient is φ = 23380.

The previous prime is 25717. The next prime is 25733. The reversal of 25729 is 92752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25729 - 2⁷ = 25601 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (25759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (7020).

2²⁵⁷²⁹ is an apocalyptic number.

It is an amenable number.

25729 is a deficient number, since it is larger than the sum of its proper divisors (2351).

25729 is a wasteful number, since it uses less digits than its factorization.

25729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350.

The product of its digits is 1260, while the sum is 25.

The square root of 25729 is about 160.4026184325. The cubic root of 25729 is about 29.5216732428.

It can be divided in two parts, 25 and 729, that multiplied together give a square (18225 = 135²).

The spelling of 25729 in words is "twenty-five thousand, seven hundred twenty-nine".