129038220 has 72 divisors (see below), whose sum is σ = 392346864. Its totient is φ = 34328448.

The previous prime is 129038219. The next prime is 129038243. The reversal of 129038220 is 22830921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135787 + ... + 136733.

It is an arithmetic number, because the mean of its divisors is an integer number (5449262).

Almost surely, 2^129038220 is an apocalyptic number.

129038220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129038220 is an abundant number, since it is smaller than the sum of its proper divisors (263308644).

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

129038220 is a wasteful number, since it uses less digits than its factorization.

129038220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 129038220 is about 11359.4991086755. The cubic root of 129038220 is about 505.3273308362.

The spelling of 129038220 in words is "one hundred twenty-nine million, thirty-eight thousand, two hundred twenty".