12189838 has 4 divisors (see below), whose sum is σ = 18284760. Its totient is φ = 6094918.

The previous prime is 12189817. The next prime is 12189847. The reversal of 12189838 is 83898121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83898121 = 31 ⋅2706391.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 12189838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3047458 + ... + 3047461.

It is an arithmetic number, because the mean of its divisors is an integer number (4571190).

Almost surely, 2^12189838 is an apocalyptic number.

12189838 is a deficient number, since it is larger than the sum of its proper divisors (6094922).

12189838 is an equidigital number, since it uses as much as digits as its factorization.

12189838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6094921.

The product of its digits is 27648, while the sum is 40.

The square root of 12189838 is about 3491.3948501996. The cubic root of 12189838 is about 230.1438167963.

The spelling of 12189838 in words is "twelve million, one hundred eighty-nine thousand, eight hundred thirty-eight".