129681188 has 48 divisors (see below), whose sum is σ = 282522240. Its totient is φ = 50713344.

The previous prime is 129681157. The next prime is 129681197. The reversal of 129681188 is 881186921.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30395 + ... + 34397.

It is an arithmetic number, because the mean of its divisors is an integer number (5885880).

Almost surely, 2^129681188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129681188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141261120).

129681188 is an abundant number, since it is smaller than the sum of its proper divisors (152841052).

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

129681188 is a wasteful number, since it uses less digits than its factorization.

129681188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116 (or 4114 counting only the distinct ones).

The product of its digits is 55296, while the sum is 44.

The square root of 129681188 is about 11387.7648377546. The cubic root of 129681188 is about 506.1652509050.

The spelling of 129681188 in words is "one hundred twenty-nine million, six hundred eighty-one thousand, one hundred eighty-eight".