129966717 has 8 divisors (see below), whose sum is σ = 183482496. Its totient is φ = 81547712.

The previous prime is 129966713. The next prime is 129966737. The reversal of 129966717 is 717669921.

It is a happy number.

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 129966717 - 2² = 129966713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129966713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274133 + ... + 1274234.

It is an arithmetic number, because the mean of its divisors is an integer number (22935312).

Almost surely, 2^129966717 is an apocalyptic number.

129966717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129966717 is a deficient number, since it is larger than the sum of its proper divisors (53515779).

129966717 is a wasteful number, since it uses less digits than its factorization.

129966717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548387.

The product of its digits is 285768, while the sum is 48.

The square root of 129966717 is about 11400.2946014566. The cubic root of 129966717 is about 506.5364661888.

The spelling of 129966717 in words is "one hundred twenty-nine million, nine hundred sixty-six thousand, seven hundred seventeen".