129199218 has 32 divisors (see below), whose sum is σ = 275057856. Its totient is φ = 40316928.

The previous prime is 129199181. The next prime is 129199223. The reversal of 129199218 is 812991921.

It is a self number, because there is not a number n which added to its sum of digits gives 129199218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16405 + ... + 22967.

It is an arithmetic number, because the mean of its divisors is an integer number (8595558).

Almost surely, 2^129199218 is an apocalyptic number.

129199218 is an abundant number, since it is smaller than the sum of its proper divisors (145858638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129199218 is a wasteful number, since it uses less digits than its factorization.

129199218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778.

The product of its digits is 23328, while the sum is 42.

The square root of 129199218 is about 11366.5833916793. The cubic root of 129199218 is about 505.5374052298.

The spelling of 129199218 in words is "one hundred twenty-nine million, one hundred ninety-nine thousand, two hundred eighteen".