129420686 has 8 divisors (see below), whose sum is σ = 194447520. Its totient is φ = 64604848.

The previous prime is 129420671. The next prime is 129420703. The reversal of 129420686 is 686024921.

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

It is a congruent number.

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, 51206 + ... + 53673.

It is an arithmetic number, because the mean of its divisors is an integer number (24305940).

Almost surely, 2^129420686 is an apocalyptic number.

129420686 is a deficient number, since it is larger than the sum of its proper divisors (65026834).

129420686 is a wasteful number, since it uses less digits than its factorization.

129420686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105498.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 129420686 is about 11376.3212858991. The cubic root of 129420686 is about 505.8260974990.

The spelling of 129420686 in words is "one hundred twenty-nine million, four hundred twenty thousand, six hundred eighty-six".