129336009 has 16 divisors (see below), whose sum is σ = 188817600. Its totient is φ = 78096960.

The previous prime is 129335981. The next prime is 129336019. The reversal of 129336009 is 900633921.

It is not a de Polignac number, because 129336009 - 2⁵ = 129335977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129336019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2067 + ... + 16215.

It is an arithmetic number, because the mean of its divisors is an integer number (11801100).

Almost surely, 2^129336009 is an apocalyptic number.

It is an amenable number.

129336009 is a deficient number, since it is larger than the sum of its proper divisors (59481591).

129336009 is a wasteful number, since it uses less digits than its factorization.

129336009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14440.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 129336009 is about 11372.5990433146. The cubic root of 129336009 is about 505.7157566087.

The spelling of 129336009 in words is "one hundred twenty-nine million, three hundred thirty-six thousand, nine".