12345643 has 2 divisors, whose sum is σ = 12345644. Its totient is φ = 12345642.

The previous prime is 12345637. The next prime is 12345647. The reversal of 12345643 is 34654321.

12345643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12345643 is a prime.

It is not a weakly prime, because it can be changed into another prime (12345647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6172821 + 6172822.

It is an arithmetic number, because the mean of its divisors is an integer number (6172822).

Almost surely, 2^12345643 is an apocalyptic number.

12345643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12345643 is an equidigital number, since it uses as much as digits as its factorization.

12345643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

The square root of 12345643 is about 3513.6367199812. The cubic root of 12345643 is about 231.1202000572.

Adding to 12345643 its reverse (34654321), we get a palindrome (46999964).

The spelling of 12345643 in words is "twelve million, three hundred forty-five thousand, six hundred forty-three".