12189819 has 4 divisors (see below), whose sum is σ = 16253096. Its totient is φ = 8126544.

The previous prime is 12189817. The next prime is 12189847. The reversal of 12189819 is 91898121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12189819 - 2¹ = 12189817 is a prime.

It is a super-2 number, since 2×12189819² = 297183374505522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12189817) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2031634 + ... + 2031639.

It is an arithmetic number, because the mean of its divisors is an integer number (4063274).

Almost surely, 2^12189819 is an apocalyptic number.

12189819 is a deficient number, since it is larger than the sum of its proper divisors (4063277).

12189819 is an equidigital number, since it uses as much as digits as its factorization.

12189819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063276.

The product of its digits is 10368, while the sum is 39.

The square root of 12189819 is about 3491.3921292230. The cubic root of 12189819 is about 230.1436972230.

The spelling of 12189819 in words is "twelve million, one hundred eighty-nine thousand, eight hundred nineteen".