129986 has 8 divisors (see below), whose sum is σ = 197184. Its totient is φ = 64260.

The previous prime is 129971. The next prime is 130003. The reversal of 129986 is 689921.

129986 is nontrivially palindromic in base 6.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (24648).

2¹²⁹⁹⁸⁶ is an apocalyptic number.

129986 is a deficient number, since it is larger than the sum of its proper divisors (67198).

129986 is a wasteful number, since it uses less digits than its factorization.

129986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736.

The product of its digits is 7776, while the sum is 35.

The square root of 129986 is about 360.5357125168. The cubic root of 129986 is about 50.6561516345.

The spelling of 129986 in words is "one hundred twenty-nine thousand, nine hundred eighty-six".