129966 has 8 divisors (see below), whose sum is σ = 259944. Its totient is φ = 43320.

The previous prime is 129959. The next prime is 129967. The reversal of 129966 is 669921.

It is a happy number.

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

129966 is an admirable number.

It is a super-2 number, since 2×129966² = 33782322312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129967) by changing a digit.

129966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10825 + ... + 10836.

It is an arithmetic number, because the mean of its divisors is an integer number (32493).

2¹²⁹⁹⁶⁶ is an apocalyptic number.

129966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129966 is a wasteful number, since it uses less digits than its factorization.

129966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21666.

The product of its digits is 5832, while the sum is 33.

The square root of 129966 is about 360.5079749465. The cubic root of 129966 is about 50.6535534701.

The spelling of 129966 in words is "one hundred twenty-nine thousand, nine hundred sixty-six".