12188720 has 40 divisors (see below), whose sum is σ = 28554720. Its totient is φ = 4838400.

The previous prime is 12188719. The next prime is 12188723. The reversal of 12188720 is 2788121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12188723) 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 7 ways as a sum of consecutive naturals, for example, 11576 + ... + 12584.

It is an arithmetic number, because the mean of its divisors is an integer number (713868).

Almost surely, 2^12188720 is an apocalyptic number.

12188720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12188720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14277360).

12188720 is an abundant number, since it is smaller than the sum of its proper divisors (16366000).

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

12188720 is a wasteful number, since it uses less digits than its factorization.

12188720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173 (or 1167 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12188720 is about 3491.2347385989. The cubic root of 12188720 is about 230.1367806444.

The spelling of 12188720 in words is "twelve million, one hundred eighty-eight thousand, seven hundred twenty".