129685797 has 12 divisors (see below), whose sum is σ = 187535244. Its totient is φ = 86359680.

The previous prime is 129685783. The next prime is 129685861. The reversal of 129685797 is 797586921.

129685797 is a `hidden beast` number, since 1 + 2 + 9 + 68 + 579 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25462116 + 104223681 = 5046^2 + 10209^2 .

It is not a de Polignac number, because 129685797 - 2¹² = 129681701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129685097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813 + ... + 16125.

It is an arithmetic number, because the mean of its divisors is an integer number (15627937).

Almost surely, 2^129685797 is an apocalyptic number.

It is an amenable number.

129685797 is a deficient number, since it is larger than the sum of its proper divisors (57849447).

129685797 is a wasteful number, since it uses less digits than its factorization.

129685797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16260 (or 16257 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 129685797 is about 11387.9672022710. The cubic root of 129685797 is about 506.1712473749.

The spelling of 129685797 in words is "one hundred twenty-nine million, six hundred eighty-five thousand, seven hundred ninety-seven".