129788900 has 36 divisors (see below), whose sum is σ = 282260580. Its totient is φ = 51801600.

The previous prime is 129788881. The next prime is 129788927. The reversal of 129788900 is 9887921.

It can be written as a sum of positive squares in 6 ways, for example, as 9535744 + 120253156 = 3088^2 + 10966^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55760 + ... + 58040.

Almost surely, 2^129788900 is an apocalyptic number.

129788900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129788900 is an abundant number, since it is smaller than the sum of its proper divisors (152471680).

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

129788900 is a wasteful number, since it uses less digits than its factorization.

129788900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 129788900 is about 11392.4931424162. The cubic root of 129788900 is about 506.3053508550.

The spelling of 129788900 in words is "one hundred twenty-nine million, seven hundred eighty-eight thousand, nine hundred".