129409327 has 4 divisors (see below), whose sum is σ = 129432240. Its totient is φ = 129386416.

The previous prime is 129409309. The next prime is 129409333. The reversal of 129409327 is 723904921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129409327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129409307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3699 + ... + 16507.

It is an arithmetic number, because the mean of its divisors is an integer number (32358060).

Almost surely, 2^129409327 is an apocalyptic number.

129409327 is a deficient number, since it is larger than the sum of its proper divisors (22913).

129409327 is a wasteful number, since it uses less digits than its factorization.

129409327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 129409327 is about 11375.8220362311. The cubic root of 129409327 is about 505.8112986109.

The spelling of 129409327 in words is "one hundred twenty-nine million, four hundred nine thousand, three hundred twenty-seven".