129393909 has 32 divisors (see below), whose sum is σ = 197769600. Its totient is φ = 83560320.

The previous prime is 129393841. The next prime is 129393949. The reversal of 129393909 is 909393921.

It is not a de Polignac number, because 129393909 - 2²⁰ = 128345333 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129393949) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 197827 + ... + 198479.

It is an arithmetic number, because the mean of its divisors is an integer number (6180300).

Almost surely, 2^129393909 is an apocalyptic number.

It is an amenable number.

129393909 is a deficient number, since it is larger than the sum of its proper divisors (68375691).

129393909 is a wasteful number, since it uses less digits than its factorization.

129393909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 129393909 is about 11375.1443507324. The cubic root of 129393909 is about 505.7912101353.

The spelling of 129393909 in words is "one hundred twenty-nine million, three hundred ninety-three thousand, nine hundred nine".