2643543 has 32 divisors (see below), whose sum is σ = 4561920. Its totient is φ = 1481760.

The previous prime is 2643523. The next prime is 2643547. The reversal of 2643543 is 3453462.

2643543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2643543 - 2⁶ = 2643479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2⁹ + 6² + 4³ + 3³ + 5 + 4¹⁰ + 3¹³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643547) 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 31 ways as a sum of consecutive naturals, for example, 13321 + ... + 13517.

It is an arithmetic number, because the mean of its divisors is an integer number (142560).

2^2643543 is an apocalyptic number.

2643543 is a deficient number, since it is larger than the sum of its proper divisors (1918377).

2643543 is a wasteful number, since it uses less digits than its factorization.

2643543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 278 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 2643543 is about 1625.8975982515. The cubic root of 2643543 is about 138.2702643097.

It can be divided in two parts, 2 and 643543, that added together give a triangular number (643545 = T₁₁₃₄).

The spelling of 2643543 in words is "two million, six hundred forty-three thousand, five hundred forty-three".