129189100 has 36 divisors (see below), whose sum is σ = 283138128. Its totient is φ = 51160000.

The previous prime is 129189097. The next prime is 129189101. The reversal of 129189100 is 1981921.

It is not an unprimeable number, because it can be changed into a prime (129189101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3705 + ... + 16495.

It is an arithmetic number, because the mean of its divisors is an integer number (7864948).

Almost surely, 2^129189100 is an apocalyptic number.

129189100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129189100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141569064).

129189100 is an abundant number, since it is smaller than the sum of its proper divisors (153949028).

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

129189100 is a wasteful number, since it uses less digits than its factorization.

129189100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906 (or 12899 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 129189100 is about 11366.1383063906. The cubic root of 129189100 is about 505.5242081401.

The spelling of 129189100 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, one hundred".