12289999 has 2 divisors, whose sum is σ = 12290000. Its totient is φ = 12289998.

The previous prime is 12289943. The next prime is 12290009. The reversal of 12289999 is 99998221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12289999 is a prime.

It is a Chen prime.

12289999 is a modest number, since divided by 9999 gives 1228 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12289909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6144999 + 6145000.

It is an arithmetic number, because the mean of its divisors is an integer number (6145000).

Almost surely, 2^12289999 is an apocalyptic number.

12289999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12289999 is an equidigital number, since it uses as much as digits as its factorization.

12289999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 12289999 is about 3505.7094859671. The cubic root of 12289999 is about 230.7724438385.

The spelling of 12289999 in words is "twelve million, two hundred eighty-nine thousand, nine hundred ninety-nine".