129686947 has 8 divisors (see below), whose sum is σ = 140010080. Its totient is φ = 119413440.

The previous prime is 129686933. The next prime is 129686957. The reversal of 129686947 is 749686921.

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 129686947 - 2⁷ = 129686819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129686894 and 129686903.

It is not an unprimeable number, because it can be changed into a prime (129686917) 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, 6879 + ... + 17512.

It is an arithmetic number, because the mean of its divisors is an integer number (17501260).

Almost surely, 2^129686947 is an apocalyptic number.

129686947 is a deficient number, since it is larger than the sum of its proper divisors (10323133).

129686947 is a wasteful number, since it uses less digits than its factorization.

129686947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24813.

The product of its digits is 1306368, while the sum is 52.

The square root of 129686947 is about 11388.0176940502. The cubic root of 129686947 is about 506.1727435429.

The spelling of 129686947 in words is "one hundred twenty-nine million, six hundred eighty-six thousand, nine hundred forty-seven".