12189869 has 2 divisors, whose sum is σ = 12189870. Its totient is φ = 12189868.

The previous prime is 12189857. The next prime is 12189871. The reversal of 12189869 is 96898121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 114244 = 3475^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 12189869 - 2¹² = 12185773 is a prime.

It is a super-2 number, since 2×12189869² = 297185812474322, which contains 22 as substring.

Together with 12189871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12189809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6094934 + 6094935.

It is an arithmetic number, because the mean of its divisors is an integer number (6094935).

Almost surely, 2^12189869 is an apocalyptic number.

It is an amenable number.

12189869 is a deficient number, since it is larger than the sum of its proper divisors (1).

12189869 is an equidigital number, since it uses as much as digits as its factorization.

12189869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 12189869 is about 3491.3992896831. The cubic root of 12189869 is about 230.1440118892.

The spelling of 12189869 in words is "twelve million, one hundred eighty-nine thousand, eight hundred sixty-nine".