129906986 has 8 divisors (see below), whose sum is σ = 212575104. Its totient is φ = 59048620.

The previous prime is 129906977. The next prime is 129907021. The reversal of 129906986 is 689609921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2952410 + ... + 2952453.

It is an arithmetic number, because the mean of its divisors is an integer number (26571888).

Almost surely, 2^129906986 is an apocalyptic number.

129906986 is a deficient number, since it is larger than the sum of its proper divisors (82668118).

129906986 is a wasteful number, since it uses less digits than its factorization.

129906986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904876.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 129906986 is about 11397.6745873884. The cubic root of 129906986 is about 506.4588551239.

The spelling of 129906986 in words is "one hundred twenty-nine million, nine hundred six thousand, nine hundred eighty-six".