129885 has 16 divisors (see below), whose sum is σ = 237696. Its totient is φ = 59328.

The previous prime is 129853. The next prime is 129887. The reversal of 129885 is 588921.

It is a happy number.

It is not a de Polignac number, because 129885 - 2⁵ = 129853 is a prime.

It is a super-2 number, since 2×129885² = 33740226450, 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 (129887) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 514 + ... + 723.

It is an arithmetic number, because the mean of its divisors is an integer number (14856).

2¹²⁹⁸⁸⁵ is an apocalyptic number.

129885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129885 is a deficient number, since it is larger than the sum of its proper divisors (107811).

129885 is a wasteful number, since it uses less digits than its factorization.

129885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its digits is 5760, while the sum is 33.

The square root of 129885 is about 360.3956159556. The cubic root of 129885 is about 50.6430281776.

The spelling of 129885 in words is "one hundred twenty-nine thousand, eight hundred eighty-five".