129931706 has 16 divisors (see below), whose sum is σ = 201496680. Its totient is φ = 62795520.

The previous prime is 129931691. The next prime is 129931727. The reversal of 129931706 is 607139921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74563225 + 55368481 = 8635^2 + 7441^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129931706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670 + ... + 16206.

Almost surely, 2^129931706 is an apocalyptic number.

129931706 is a deficient number, since it is larger than the sum of its proper divisors (71564974).

129931706 is a wasteful number, since it uses less digits than its factorization.

129931706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14689.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 129931706 is about 11398.7589675368. The cubic root of 129931706 is about 506.4909777711.

The spelling of 129931706 in words is "one hundred twenty-nine million, nine hundred thirty-one thousand, seven hundred six".