129069900 has 108 divisors (see below), whose sum is σ = 411369504. Its totient is φ = 33840000.

The previous prime is 129069881. The next prime is 129069911. The reversal of 129069900 is 9960921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53725 + ... + 56075.

Almost surely, 2^129069900 is an apocalyptic number.

129069900 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 129069900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205684752).

129069900 is an abundant number, since it is smaller than the sum of its proper divisors (282299604).

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

129069900 is a wasteful number, since it uses less digits than its factorization.

129069900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432 (or 2422 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 129069900 is about 11360.8934507811. The cubic root of 129069900 is about 505.3686815304.

The spelling of 129069900 in words is "one hundred twenty-nine million, sixty-nine thousand, nine hundred".