12187656 has 96 divisors (see below), whose sum is σ = 36855000. Its totient is φ = 3612672.

The previous prime is 12187649. The next prime is 12187661. The reversal of 12187656 is 65678121.

12187656 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in 4 ways, for example, as 9180900 + 3006756 = 3030^2 + 1734^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 12187656.

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 23 ways as a sum of consecutive naturals, for example, 26920 + ... + 27368.

Almost surely, 2^12187656 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 12187656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18427500).

12187656 is an abundant number, since it is smaller than the sum of its proper divisors (24667344).

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

12187656 is a wasteful number, since it uses less digits than its factorization.

12187656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 496 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12187656 is about 3491.0823536548. The cubic root of 12187656 is about 230.1300839429.

The spelling of 12187656 in words is "twelve million, one hundred eighty-seven thousand, six hundred fifty-six".