129885209 has 8 divisors (see below), whose sum is σ = 135816000. Its totient is φ = 123978096.

The previous prime is 129885191. The next prime is 129885211. The reversal of 129885209 is 902588921.

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

It is a de Polignac number, because none of the positive numbers 2^k-129885209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129885209.

It is not an unprimeable number, because it can be changed into a prime (129881209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 17135.

It is an arithmetic number, because the mean of its divisors is an integer number (16977000).

Almost surely, 2^129885209 is an apocalyptic number.

It is an amenable number.

129885209 is a deficient number, since it is larger than the sum of its proper divisors (5930791).

129885209 is a wasteful number, since it uses less digits than its factorization.

129885209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11839.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 129885209 is about 11396.7192208986. The cubic root of 129885209 is about 506.4305534105.

The spelling of 129885209 in words is "one hundred twenty-nine million, eight hundred eighty-five thousand, two hundred nine".