129118220 has 48 divisors (see below), whose sum is σ = 338059008. Its totient is φ = 40244160.

The previous prime is 129118217. The next prime is 129118261. The reversal of 129118220 is 22811921.

It is a self number, because there is not a number n which added to its sum of digits gives 129118220.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 40382 + ... + 43461.

It is an arithmetic number, because the mean of its divisors is an integer number (7042896).

Almost surely, 2^129118220 is an apocalyptic number.

129118220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129118220 is an abundant number, since it is smaller than the sum of its proper divisors (208940788).

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

129118220 is a wasteful number, since it uses less digits than its factorization.

129118220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83870 (or 83868 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 129118220 is about 11363.0198450940. The cubic root of 129118220 is about 505.4317387524.

The spelling of 129118220 in words is "one hundred twenty-nine million, one hundred eighteen thousand, two hundred twenty".