129305138 has 8 divisors (see below), whose sum is σ = 194171520. Its totient is φ = 64581300.

The previous prime is 129305117. The next prime is 129305147. The reversal of 129305138 is 831503921.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33338 + ... + 37013.

It is an arithmetic number, because the mean of its divisors is an integer number (24271440).

Almost surely, 2^129305138 is an apocalyptic number.

129305138 is a deficient number, since it is larger than the sum of its proper divisors (64866382).

129305138 is an equidigital number, since it uses as much as digits as its factorization.

129305138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71272.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 129305138 is about 11371.2417088021. The cubic root of 129305138 is about 505.6755172520.

The spelling of 129305138 in words is "one hundred twenty-nine million, three hundred five thousand, one hundred thirty-eight".