12889643 has 4 divisors (see below), whose sum is σ = 13881168. Its totient is φ = 11898120.

The previous prime is 12889627. The next prime is 12889649. The reversal of 12889643 is 34698821.

12889643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12889643 - 2⁴ = 12889627 is a prime.

It is a super-2 number, since 2×12889643² = 332285793334898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12889643.

It is not an unprimeable number, because it can be changed into a prime (12889649) 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, 495743 + ... + 495768.

It is an arithmetic number, because the mean of its divisors is an integer number (3470292).

Almost surely, 2^12889643 is an apocalyptic number.

12889643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12889643 is a deficient number, since it is larger than the sum of its proper divisors (991525).

12889643 is an equidigital number, since it uses as much as digits as its factorization.

12889643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991524.

The product of its digits is 82944, while the sum is 41.

The square root of 12889643 is about 3590.2148960752. The cubic root of 12889643 is about 234.4662277868.

The spelling of 12889643 in words is "twelve million, eight hundred eighty-nine thousand, six hundred forty-three".