12289643 has 4 divisors (see below), whose sum is σ = 12351600. Its totient is φ = 12227688.

The previous prime is 12289639. The next prime is 12289679. The reversal of 12289643 is 34698221.

12289643 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34698221 = 719 ⋅48259.

It is a cyclic number.

It is not a de Polignac number, because 12289643 - 2² = 12289639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12289943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30680 + ... + 31077.

It is an arithmetic number, because the mean of its divisors is an integer number (3087900).

Almost surely, 2^12289643 is an apocalyptic number.

12289643 is a deficient number, since it is larger than the sum of its proper divisors (61957).

12289643 is an equidigital number, since it uses as much as digits as its factorization.

12289643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61956.

The product of its digits is 20736, while the sum is 35.

The square root of 12289643 is about 3505.6587112838. The cubic root of 12289643 is about 230.7702155827.

The spelling of 12289643 in words is "twelve million, two hundred eighty-nine thousand, six hundred forty-three".