129908788 has 12 divisors (see below), whose sum is σ = 227644452. Its totient is φ = 64867520.

The previous prime is 129908767. The next prime is 129908789. The reversal of 129908788 is 887809921.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 104284944 = 5062^2 + 10212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129908789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18295 + ... + 24382.

It is an arithmetic number, because the mean of its divisors is an integer number (18970371).

Almost surely, 2^129908788 is an apocalyptic number.

It is an amenable number.

129908788 is a deficient number, since it is larger than the sum of its proper divisors (97735664).

129908788 is a wasteful number, since it uses less digits than its factorization.

129908788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43442 (or 43440 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 129908788 is about 11397.7536383272. The cubic root of 129908788 is about 506.4611968882.

The spelling of 129908788 in words is "one hundred twenty-nine million, nine hundred eight thousand, seven hundred eighty-eight".