12889447 has 2 divisors, whose sum is σ = 12889448. Its totient is φ = 12889446.

The previous prime is 12889433. The next prime is 12889469. The reversal of 12889447 is 74498821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12889447 is a prime.

It is a super-2 number, since 2×12889447² = 332275687931618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12889477) 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, 6444723 + 6444724.

It is an arithmetic number, because the mean of its divisors is an integer number (6444724).

Almost surely, 2^12889447 is an apocalyptic number.

12889447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12889447 is an equidigital number, since it uses as much as digits as its factorization.

12889447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 12889447 is about 3590.1875995552. The cubic root of 12889447 is about 234.4650393490.

The spelling of 12889447 in words is "twelve million, eight hundred eighty-nine thousand, four hundred forty-seven".