40543999 has 2 divisors, whose sum is σ = 40544000. Its totient is φ = 40543998.

The previous prime is 40543991. The next prime is 40544011. The reversal of 40543999 is 99934504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40543999 - 2³ = 40543991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40543991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20271999 + 20272000.

It is an arithmetic number, because the mean of its divisors is an integer number (20272000).

Almost surely, 2^40543999 is an apocalyptic number.

40543999 is a deficient number, since it is larger than the sum of its proper divisors (1).

40543999 is an equidigital number, since it uses as much as digits as its factorization.

40543999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 40543999 is about 6367.4169802205. The cubic root of 40543999 is about 343.5385889481.

The spelling of 40543999 in words is "forty million, five hundred forty-three thousand, nine hundred ninety-nine".