12189856 has 24 divisors (see below), whose sum is σ = 27427680. Its totient is φ = 5224128.

The previous prime is 12189847. The next prime is 12189857. The reversal of 12189856 is 65898121.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (12189857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26986 + ... + 27433.

It is an arithmetic number, because the mean of its divisors is an integer number (1142820).

Almost surely, 2^12189856 is an apocalyptic number.

12189856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12189856 is an abundant number, since it is smaller than the sum of its proper divisors (15237824).

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

12189856 is an equidigital number, since it uses as much as digits as its factorization.

12189856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54436 (or 54428 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 12189856 is about 3491.3974279649. The cubic root of 12189856 is about 230.1439300761.

The spelling of 12189856 in words is "twelve million, one hundred eighty-nine thousand, eight hundred fifty-six".