129732817 has 8 divisors (see below), whose sum is σ = 139138560. Its totient is φ = 120584880.

The previous prime is 129732809. The next prime is 129732853. The reversal of 129732817 is 718237921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129732817 - 2³ = 129732809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129732817.

It is not an unprimeable number, because it can be changed into a prime (129732887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63409 + ... + 65422.

It is an arithmetic number, because the mean of its divisors is an integer number (17392320).

Almost surely, 2^129732817 is an apocalyptic number.

It is an amenable number.

129732817 is a deficient number, since it is larger than the sum of its proper divisors (9405743).

129732817 is a wasteful number, since it uses less digits than its factorization.

129732817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128903.

The product of its digits is 42336, while the sum is 40.

The square root of 129732817 is about 11390.0314749346. The cubic root of 129732817 is about 506.2324139194.

The spelling of 129732817 in words is "one hundred twenty-nine million, seven hundred thirty-two thousand, eight hundred seventeen".