12638543 has 2 divisors, whose sum is σ = 12638544. Its totient is φ = 12638542.

The previous prime is 12638533. The next prime is 12638551. The reversal of 12638543 is 34583621.

12638543 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 not a de Polignac number, because 12638543 - 2¹⁰ = 12637519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319271 + 6319272.

It is an arithmetic number, because the mean of its divisors is an integer number (6319272).

Almost surely, 2^12638543 is an apocalyptic number.

12638543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638543 is an equidigital number, since it uses as much as digits as its factorization.

12638543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 12638543 is about 3555.0728543871. The cubic root of 12638543 is about 232.9337062037.

The spelling of 12638543 in words is "twelve million, six hundred thirty-eight thousand, five hundred forty-three".