12129885 has 32 divisors (see below), whose sum is σ = 22704000. Its totient is φ = 6127488.

The previous prime is 12129883. The next prime is 12129889. The reversal of 12129885 is 58892121.

It is not a de Polignac number, because 12129885 - 2¹ = 12129883 is a prime.

It is a super-2 number, since 2×12129885² = 294268220226450, 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 (12129883) 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 31 ways as a sum of consecutive naturals, for example, 201 + ... + 4929.

It is an arithmetic number, because the mean of its divisors is an integer number (709500).

Almost surely, 2^12129885 is an apocalyptic number.

12129885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12129885 is a deficient number, since it is larger than the sum of its proper divisors (10574115).

12129885 is a wasteful number, since it uses less digits than its factorization.

12129885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762 (or 4756 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12129885 is about 3482.7984437805. The cubic root of 12129885 is about 229.7658928581.

The spelling of 12129885 in words is "twelve million, one hundred twenty-nine thousand, eight hundred eighty-five".