129725 has 6 divisors (see below), whose sum is σ = 160890. Its totient is φ = 103760.

The previous prime is 129719. The next prime is 129733. The reversal of 129725 is 527921.

129725 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 3 ways, for example, as 20164 + 109561 = 142^2 + 331^2 .

It is not a de Polignac number, because 129725 - 2⁸ = 129469 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129694 and 129703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2570 + ... + 2619.

It is an arithmetic number, because the mean of its divisors is an integer number (26815).

2¹²⁹⁷²⁵ is an apocalyptic number.

It is an amenable number.

129725 is a deficient number, since it is larger than the sum of its proper divisors (31165).

129725 is an equidigital number, since it uses as much as digits as its factorization.

129725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199 (or 5194 counting only the distinct ones).

The product of its digits is 1260, while the sum is 26.

The square root of 129725 is about 360.1735692690. The cubic root of 129725 is about 50.6222246103.

The spelling of 129725 in words is "one hundred twenty-nine thousand, seven hundred twenty-five".