12999989 has 2 divisors, whose sum is σ = 12999990. Its totient is φ = 12999988.

The previous prime is 12999983. The next prime is 12999997. The reversal of 12999989 is 98999921.

12999989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 432964 = 3545^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 12999989 - 2²⁰ = 11951413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12999983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6499994 + 6499995.

It is an arithmetic number, because the mean of its divisors is an integer number (6499995).

Almost surely, 2^12999989 is an apocalyptic number.

It is an amenable number.

12999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12999989 is an equidigital number, since it uses as much as digits as its factorization.

12999989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 56.

The square root of 12999989 is about 3605.5497500381. The cubic root of 12999989 is about 235.1334024524.

It can be divided in two parts, 12 and 999989, that added together give a palindrome (1000001).

The spelling of 12999989 in words is "twelve million, nine hundred ninety-nine thousand, nine hundred eighty-nine".