129905507 has 8 divisors (see below), whose sum is σ = 133636272. Its totient is φ = 126201600.

The previous prime is 129905497. The next prime is 129905513. The reversal of 129905507 is 705509921.

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 129905507 - 2²² = 125711203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129901507) 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, 3308 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (16704534).

Almost surely, 2^129905507 is an apocalyptic number.

129905507 is a deficient number, since it is larger than the sum of its proper divisors (3730765).

129905507 is a wasteful number, since it uses less digits than its factorization.

129905507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13429.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 129905507 is about 11397.6097055479. The cubic root of 129905507 is about 506.4569330936.

The spelling of 129905507 in words is "one hundred twenty-nine million, nine hundred five thousand, five hundred seven".