129409 has 12 divisors (see below), whose sum is σ = 159600. Its totient is φ = 104328.

The previous prime is 129403. The next prime is 129419. The reversal of 129409 is 904921.

It is not a de Polignac number, because 129409 - 2³ = 129401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 862 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (13300).

2¹²⁹⁴⁰⁹ is an apocalyptic number.

129409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129409 is a deficient number, since it is larger than the sum of its proper divisors (30191).

129409 is a wasteful number, since it uses less digits than its factorization.

129409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 129409 is about 359.7346244108. The cubic root of 129409 is about 50.5810872571.

The spelling of 129409 in words is "one hundred twenty-nine thousand, four hundred nine".