129934905 has 8 divisors (see below), whose sum is σ = 207895872. Its totient is φ = 69298608.

The previous prime is 129934891. The next prime is 129934907. The reversal of 129934905 is 509439921.

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

It is not a de Polignac number, because 129934905 - 2⁵ = 129934873 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129934907) 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, 4331149 + ... + 4331178.

It is an arithmetic number, because the mean of its divisors is an integer number (25986984).

Almost surely, 2^129934905 is an apocalyptic number.

129934905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129934905 is a deficient number, since it is larger than the sum of its proper divisors (77960967).

129934905 is an equidigital number, since it uses as much as digits as its factorization.

129934905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8662335.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 129934905 is about 11398.8992889665. The cubic root of 129934905 is about 506.4951344454.

The spelling of 129934905 in words is "one hundred twenty-nine million, nine hundred thirty-four thousand, nine hundred five".