40209943 has 2 divisors, whose sum is σ = 40209944. Its totient is φ = 40209942.

The previous prime is 40209901. The next prime is 40209989. The reversal of 40209943 is 34990204.

40209943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40209943 - 2²¹ = 38112791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40207943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20104971 + 20104972.

It is an arithmetic number, because the mean of its divisors is an integer number (20104972).

Almost surely, 2^40209943 is an apocalyptic number.

40209943 is a deficient number, since it is larger than the sum of its proper divisors (1).

40209943 is an equidigital number, since it uses as much as digits as its factorization.

40209943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 40209943 is about 6341.1310505303. The cubic root of 40209943 is about 342.5924747189.

The spelling of 40209943 in words is "forty million, two hundred nine thousand, nine hundred forty-three".