129684899 has 8 divisors (see below), whose sum is σ = 138240000. Its totient is φ = 121302792.

The previous prime is 129684887. The next prime is 129684913. The reversal of 129684899 is 998486921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129684899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129684859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41699 + ... + 44700.

It is an arithmetic number, because the mean of its divisors is an integer number (17280000).

Almost surely, 2^129684899 is an apocalyptic number.

129684899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129684899 is a deficient number, since it is larger than the sum of its proper divisors (8555101).

129684899 is an equidigital number, since it uses as much as digits as its factorization.

129684899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86497.

The product of its digits is 2239488, while the sum is 56.

The square root of 129684899 is about 11387.9277746217. The cubic root of 129684899 is about 506.1700790567.

The spelling of 129684899 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, eight hundred ninety-nine".