129866 has 8 divisors (see below), whose sum is σ = 212544. Its totient is φ = 59020.

The previous prime is 129853. The next prime is 129887. The reversal of 129866 is 668921.

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 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, 2930 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (26568).

2¹²⁹⁸⁶⁶ is an apocalyptic number.

129866 is a deficient number, since it is larger than the sum of its proper divisors (82678).

129866 is a wasteful number, since it uses less digits than its factorization.

129866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5916.

The product of its digits is 5184, while the sum is 32.

The square root of 129866 is about 360.3692550704. The cubic root of 129866 is about 50.6405586482.

The spelling of 129866 in words is "one hundred twenty-nine thousand, eight hundred sixty-six".