129733409 has 16 divisors (see below), whose sum is σ = 154369152. Its totient is φ = 107804928.

The previous prime is 129733403. The next prime is 129733441. The reversal of 129733409 is 904337921.

It is a cyclic number.

It is not a de Polignac number, because 129733409 - 2⁴ = 129733393 is a prime.

It is a super-2 number, since 2×129733409² = 33661514821522562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129733403) 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, 7679 + ... + 17844.

It is an arithmetic number, because the mean of its divisors is an integer number (9648072).

Almost surely, 2^129733409 is an apocalyptic number.

It is an amenable number.

129733409 is a deficient number, since it is larger than the sum of its proper divisors (24635743).

129733409 is a wasteful number, since it uses less digits than its factorization.

129733409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25576.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 129733409 is about 11390.0574625416. The cubic root of 129733409 is about 506.2331839357.

The spelling of 129733409 in words is "one hundred twenty-nine million, seven hundred thirty-three thousand, four hundred nine".