129929 has 4 divisors (see below), whose sum is σ = 133140. Its totient is φ = 126720.

The previous prime is 129919. The next prime is 129937. The reversal of 129929 is 929921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51529 + 78400 = 227^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129895 and 129904.

It is not an unprimeable number, because it can be changed into a prime (129919) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1544 + ... + 1625.

It is an arithmetic number, because the mean of its divisors is an integer number (33285).

2¹²⁹⁹²⁹ is an apocalyptic number.

It is an amenable number.

129929 is a deficient number, since it is larger than the sum of its proper divisors (3211).

129929 is an equidigital number, since it uses as much as digits as its factorization.

129929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210.

The product of its digits is 2916, while the sum is 32.

The square root of 129929 is about 360.4566548144. The cubic root of 129929 is about 50.6487461631.

The spelling of 129929 in words is "one hundred twenty-nine thousand, nine hundred twenty-nine".