40543 has 2 divisors, whose sum is σ = 40544. Its totient is φ = 40542.

The previous prime is 40531. The next prime is 40559. The reversal of 40543 is 34504.

It is an a-pointer prime, because the next prime (40559) can be obtained adding 40543 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40543 - 2⁹ = 40031 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40583) 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 as a sum of consecutive naturals, namely, 20271 + 20272.

It is an arithmetic number, because the mean of its divisors is an integer number (20272).

2⁴⁰⁵⁴³ is an apocalyptic number.

40543 is a deficient number, since it is larger than the sum of its proper divisors (1).

40543 is an equidigital number, since it uses as much as digits as its factorization.

40543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 40543 is about 201.3529239917. The cubic root of 40543 is about 34.3535767340.

The spelling of 40543 in words is "forty thousand, five hundred forty-three".