129505 has 8 divisors (see below), whose sum is σ = 158400. Its totient is φ = 101616.

The previous prime is 129499. The next prime is 129509. The reversal of 129505 is 505921.

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

It is a cyclic number.

It is not a de Polignac number, because 129505 - 2³ = 129497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129509) 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, 76 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (19800).

129505 is a Friedman number, since it can be written as 25901*5, using all its digits and the basic arithmetic operations.

2¹²⁹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

129505 is a deficient number, since it is larger than the sum of its proper divisors (28895).

129505 is an equidigital number, since it uses as much as digits as its factorization.

129505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 129505 is about 359.8680313671. The cubic root of 129505 is about 50.5935917562.

The spelling of 129505 in words is "one hundred twenty-nine thousand, five hundred five".