2042543 has 4 divisors (see below), whose sum is σ = 2090088. Its totient is φ = 1995000.

The previous prime is 2042531. The next prime is 2042549. The reversal of 2042543 is 3452402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3452402 = 2 ⋅1726201.

It is a cyclic number.

It is not a de Polignac number, because 2042543 - 2¹⁰ = 2041519 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 (2042549) 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, 23708 + ... + 23793.

It is an arithmetic number, because the mean of its divisors is an integer number (522522).

2^2042543 is an apocalyptic number.

2042543 is a deficient number, since it is larger than the sum of its proper divisors (47545).

2042543 is an equidigital number, since it uses as much as digits as its factorization.

2042543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47544.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 2042543 is about 1429.1756365122. The cubic root of 2042543 is about 126.8791915430.

Adding to 2042543 its reverse (3452402), we get a palindrome (5494945).

It can be divided in two parts, 20 and 42543, that multiplied together give a triangular number (850860 = T₁₃₀₄).

The spelling of 2042543 in words is "two million, forty-two thousand, five hundred forty-three".