129705 has 8 divisors (see below), whose sum is σ = 207552. Its totient is φ = 69168.

The previous prime is 129671. The next prime is 129707. The reversal of 129705 is 507921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129705 - 2⁶ = 129641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129707) 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 7 ways as a sum of consecutive naturals, for example, 4309 + ... + 4338.

It is an arithmetic number, because the mean of its divisors is an integer number (25944).

2¹²⁹⁷⁰⁵ is an apocalyptic number.

129705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129705 is a deficient number, since it is larger than the sum of its proper divisors (77847).

129705 is an equidigital number, since it uses as much as digits as its factorization.

129705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8655.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 129705 is about 360.1458038073. The cubic root of 129705 is about 50.6196229619.

The spelling of 129705 in words is "one hundred twenty-nine thousand, seven hundred five".