2639543 has 4 divisors (see below), whose sum is σ = 2710920. Its totient is φ = 2568168.

The previous prime is 2639521. The next prime is 2639561. The reversal of 2639543 is 3459362.

2639543 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, and also an emirpimes, since its reverse is a distinct semiprime: 3459362 = 2 ⋅1729681.

It is a cyclic number.

It is not a de Polignac number, because 2639543 - 2¹² = 2635447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35633 + ... + 35706.

It is an arithmetic number, because the mean of its divisors is an integer number (677730).

2^2639543 is an apocalyptic number.

2639543 is a deficient number, since it is larger than the sum of its proper divisors (71377).

2639543 is an equidigital number, since it uses as much as digits as its factorization.

2639543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71376.

The product of its digits is 19440, while the sum is 32.

The square root of 2639543 is about 1624.6670428122. The cubic root of 2639543 is about 138.2004892324.

The spelling of 2639543 in words is "two million, six hundred thirty-nine thousand, five hundred forty-three".