129984329 has 4 divisors (see below), whose sum is σ = 137630484. Its totient is φ = 122338176.

The previous prime is 129984307. The next prime is 129984341. The reversal of 129984329 is 923489921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923489921 = 281 ⋅3286441.

It can be written as a sum of positive squares in 2 ways, for example, as 69689104 + 60295225 = 8348^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 129984329 - 2²⁰ = 128935753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129984359) 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, 3823052 + ... + 3823085.

It is an arithmetic number, because the mean of its divisors is an integer number (34407621).

Almost surely, 2^129984329 is an apocalyptic number.

It is an amenable number.

129984329 is a deficient number, since it is larger than the sum of its proper divisors (7646155).

129984329 is an equidigital number, since it uses as much as digits as its factorization.

129984329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646154.

The product of its digits is 279936, while the sum is 47.

The square root of 129984329 is about 11401.0670114687. The cubic root of 129984329 is about 506.5593456806.

The spelling of 129984329 in words is "one hundred twenty-nine million, nine hundred eighty-four thousand, three hundred twenty-nine".