129405409 has 16 divisors (see below), whose sum is σ = 156297600. Its totient is φ = 104661504.

The previous prime is 129405401. The next prime is 129405413. The reversal of 129405409 is 904504921.

It is a cyclic number.

It is not a de Polignac number, because 129405409 - 2³ = 129405401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129405401) 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, 33969 + ... + 37585.

It is an arithmetic number, because the mean of its divisors is an integer number (9768600).

Almost surely, 2^129405409 is an apocalyptic number.

129405409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129405409 is a deficient number, since it is larger than the sum of its proper divisors (26892191).

129405409 is a wasteful number, since it uses less digits than its factorization.

129405409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 129405409 is about 11375.6498275923. The cubic root of 129405409 is about 505.8061939076.

The spelling of 129405409 in words is "one hundred twenty-nine million, four hundred five thousand, four hundred nine".