129438242 has 8 divisors (see below), whose sum is σ = 194311632. Its totient is φ = 64667700.

The previous prime is 129438233. The next prime is 129438293. The reversal of 129438242 is 242834921.

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, 22484 + ... + 27647.

It is an arithmetic number, because the mean of its divisors is an integer number (24288954).

Almost surely, 2^129438242 is an apocalyptic number.

129438242 is a deficient number, since it is larger than the sum of its proper divisors (64873390).

129438242 is a wasteful number, since it uses less digits than its factorization.

129438242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51424.

The product of its digits is 27648, while the sum is 35.

The square root of 129438242 is about 11377.0928624144. The cubic root of 129438242 is about 505.8489683443.

The spelling of 129438242 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, two hundred forty-two".