12129636 has 48 divisors (see below), whose sum is σ = 30796416. Its totient is φ = 3700224.

The previous prime is 12129617. The next prime is 12129659. The reversal of 12129636 is 63692121.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 13.

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 15 ways as a sum of consecutive naturals, for example, 6745 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (641592).

Almost surely, 2^12129636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12129636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15398208).

12129636 is an abundant number, since it is smaller than the sum of its proper divisors (18666780).

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

12129636 is a wasteful number, since it uses less digits than its factorization.

12129636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1666 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 12129636 is about 3482.7626964811. The cubic root of 12129636 is about 229.7643206503.

The spelling of 12129636 in words is "twelve million, one hundred twenty-nine thousand, six hundred thirty-six".