40442400209 has 2 divisors, whose sum is σ = 40442400210. Its totient is φ = 40442400208.

The previous prime is 40442400197. The next prime is 40442400227. The reversal of 40442400209 is 90200424404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40120090000 + 322310209 = 200300^2 + 17953^2 .

It is a cyclic number.

It is not a de Polignac number, because 40442400209 - 2⁸ = 40442399953 is a prime.

It is not a weakly prime, because it can be changed into another prime (40442400269) 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, 20221200104 + 20221200105.

It is an arithmetic number, because the mean of its divisors is an integer number (20221200105).

Almost surely, 2^40442400209 is an apocalyptic number.

It is an amenable number.

40442400209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40442400209 is an equidigital number, since it uses as much as digits as its factorization.

40442400209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

The spelling of 40442400209 in words is "forty billion, four hundred forty-two million, four hundred thousand, two hundred nine".