129785242 has 8 divisors (see below), whose sum is σ = 206129556. Its totient is φ = 61075392.

The previous prime is 129785239. The next prime is 129785261. The reversal of 129785242 is 242587921.

129785242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 129481641 + 303601 = 11379^2 + 551^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 129785195 and 129785204.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1908573 + ... + 1908640.

Almost surely, 2^129785242 is an apocalyptic number.

129785242 is a deficient number, since it is larger than the sum of its proper divisors (76344314).

129785242 is a wasteful number, since it uses less digits than its factorization.

129785242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817232.

The product of its digits is 80640, while the sum is 40.

The square root of 129785242 is about 11392.3325969706. The cubic root of 129785242 is about 506.3005942017.

The spelling of 129785242 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, two hundred forty-two".