12188813 has 16 divisors (see below), whose sum is σ = 15886080. Its totient is φ = 9075456.

The previous prime is 12188809. The next prime is 12188843. The reversal of 12188813 is 31888121.

It is a happy number.

It is not a de Polignac number, because 12188813 - 2² = 12188809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12188813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12188843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2393 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (992880).

Almost surely, 2^12188813 is an apocalyptic number.

12188813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12188813 is a deficient number, since it is larger than the sum of its proper divisors (3697267).

12188813 is a wasteful number, since it uses less digits than its factorization.

12188813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916.

The product of its digits is 3072, while the sum is 32.

The square root of 12188813 is about 3491.2480576436. The cubic root of 12188813 is about 230.1373659579.

The spelling of 12188813 in words is "twelve million, one hundred eighty-eight thousand, eight hundred thirteen".