129994657 has 8 divisors (see below), whose sum is σ = 140555520. Its totient is φ = 119514000.

The previous prime is 129994651. The next prime is 129994679. The reversal of 129994657 is 756499921.

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 129994657 - 2³ = 129994649 is a prime.

It is a super-2 number, since 2×129994657² = 33797221697095298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129994651) 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, 16657 + ... + 23182.

It is an arithmetic number, because the mean of its divisors is an integer number (17569440).

Almost surely, 2^129994657 is an apocalyptic number.

It is an amenable number.

129994657 is a deficient number, since it is larger than the sum of its proper divisors (10560863).

129994657 is a wasteful number, since it uses less digits than its factorization.

129994657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40103.

The product of its digits is 1224720, while the sum is 52.

The square root of 129994657 is about 11401.5199425340. The cubic root of 129994657 is about 506.5727616731.

The spelling of 129994657 in words is "one hundred twenty-nine million, nine hundred ninety-four thousand, six hundred fifty-seven".