2005543 has 4 divisors (see below), whose sum is σ = 2020320. Its totient is φ = 1990768.

The previous prime is 2005519. The next prime is 2005547. The reversal of 2005543 is 3455002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2005543 - 2¹³ = 1997351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2005543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7183 + ... + 7456.

It is an arithmetic number, because the mean of its divisors is an integer number (505080).

2^2005543 is an apocalyptic number.

2005543 is a deficient number, since it is larger than the sum of its proper divisors (14777).

2005543 is a wasteful number, since it uses less digits than its factorization.

2005543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14776.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 2005543 is about 1416.1719528362. The cubic root of 2005543 is about 126.1083933308.

The spelling of 2005543 in words is "two million, five thousand, five hundred forty-three".