129581706 has 8 divisors (see below), whose sum is σ = 259163424. Its totient is φ = 43193900.

The previous prime is 129581623. The next prime is 129581719. The reversal of 129581706 is 607185921.

It is a sphenic number, since it is the product of 3 distinct primes.

129581706 is an admirable number.

It is an unprimeable number.

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, 10798470 + ... + 10798481.

It is an arithmetic number, because the mean of its divisors is an integer number (32395428).

Almost surely, 2^129581706 is an apocalyptic number.

129581706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129581706 is a wasteful number, since it uses less digits than its factorization.

129581706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21596956.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 129581706 is about 11383.3960662010. The cubic root of 129581706 is about 506.0357867069.

The spelling of 129581706 in words is "one hundred twenty-nine million, five hundred eighty-one thousand, seven hundred six".