129742705 has 8 divisors (see below), whose sum is σ = 155765952. Its totient is φ = 103744368.

The previous prime is 129742703. The next prime is 129742709. The reversal of 129742705 is 507247921.

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 129742705 - 2¹ = 129742703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129742703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8334 + ... + 18136.

It is an arithmetic number, because the mean of its divisors is an integer number (19470744).

Almost surely, 2^129742705 is an apocalyptic number.

It is an amenable number.

129742705 is a deficient number, since it is larger than the sum of its proper divisors (26023247).

129742705 is an equidigital number, since it uses as much as digits as its factorization.

129742705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12455.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 129742705 is about 11390.4655304338. The cubic root of 129742705 is about 506.2452749648.

The spelling of 129742705 in words is "one hundred twenty-nine million, seven hundred forty-two thousand, seven hundred five".