40640543 has 2 divisors, whose sum is σ = 40640544. Its totient is φ = 40640542.

The previous prime is 40640531. The next prime is 40640569. The reversal of 40640543 is 34504604.

It is an a-pointer prime, because the next prime (40640569) can be obtained adding 40640543 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40640543 - 2⁴ = 40640527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40640573) 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, 20320271 + 20320272.

It is an arithmetic number, because the mean of its divisors is an integer number (20320272).

Almost surely, 2^40640543 is an apocalyptic number.

40640543 is a deficient number, since it is larger than the sum of its proper divisors (1).

40640543 is an equidigital number, since it uses as much as digits as its factorization.

40640543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 40640543 is about 6374.9935686242. The cubic root of 40640543 is about 343.8110526050.

The spelling of 40640543 in words is "forty million, six hundred forty thousand, five hundred forty-three".