129188900 has 36 divisors (see below), whose sum is σ = 286315008. Its totient is φ = 50574240.

The previous prime is 129188897. The next prime is 129188921. The reversal of 129188900 is 9881921.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9044 + ... + 18443.

Almost surely, 2^129188900 is an apocalyptic number.

129188900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129188900 is an abundant number, since it is smaller than the sum of its proper divisors (157126108).

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

129188900 is a wasteful number, since it uses less digits than its factorization.

129188900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27548 (or 27541 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 129188900 is about 11366.1295083243. The cubic root of 129188900 is about 505.5239472695.

The spelling of 129188900 in words is "one hundred twenty-nine million, one hundred eighty-eight thousand, nine hundred".