40405543 has 2 divisors, whose sum is σ = 40405544. Its totient is φ = 40405542.

The previous prime is 40405529. The next prime is 40405559. The reversal of 40405543 is 34550404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40405543 - 2²⁵ = 6851111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40405843) 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, 20202771 + 20202772.

It is an arithmetic number, because the mean of its divisors is an integer number (20202772).

Almost surely, 2^40405543 is an apocalyptic number.

40405543 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405543 is an equidigital number, since it uses as much as digits as its factorization.

40405543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 40405543 is about 6356.5354557337. The cubic root of 40405543 is about 343.1470864889.

Adding to 40405543 its reverse (34550404), we get a palindrome (74955947).

The spelling of 40405543 in words is "forty million, four hundred five thousand, five hundred forty-three".