2006543 has 24 divisors (see below), whose sum is σ = 2655744. Its totient is φ = 1481040.

The previous prime is 2006507. The next prime is 2006549. The reversal of 2006543 is 3456002.

It is not a de Polignac number, because 2006543 - 2⁸ = 2006287 is a prime.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006549) 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 23 ways as a sum of consecutive naturals, for example, 19430 + ... + 19532.

It is an arithmetic number, because the mean of its divisors is an integer number (110656).

2^2006543 is an apocalyptic number.

2006543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2006543 is a deficient number, since it is larger than the sum of its proper divisors (649201).

2006543 is a wasteful number, since it uses less digits than its factorization.

2006543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2006543 is about 1416.5249733062. The cubic root of 2006543 is about 126.1293498231.

The spelling of 2006543 in words is "two million, six thousand, five hundred forty-three".