12639543 has 8 divisors (see below), whose sum is σ = 19260288. Its totient is φ = 7222584.

The previous prime is 12639527. The next prime is 12639547. The reversal of 12639543 is 34593621.

12639543 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12639543 - 2⁴ = 12639527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639547) 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 in 7 ways as a sum of consecutive naturals, for example, 300921 + ... + 300962.

It is an arithmetic number, because the mean of its divisors is an integer number (2407536).

Almost surely, 2^12639543 is an apocalyptic number.

12639543 is a deficient number, since it is larger than the sum of its proper divisors (6620745).

12639543 is an equidigital number, since it uses as much as digits as its factorization.

12639543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601893.

The product of its digits is 19440, while the sum is 33.

The square root of 12639543 is about 3555.2134956990. The cubic root of 12639543 is about 232.9398495163.

The spelling of 12639543 in words is "twelve million, six hundred thirty-nine thousand, five hundred forty-three".