7385540209 has 2 divisors, whose sum is σ = 7385540210. Its totient is φ = 7385540208.

The previous prime is 7385540177. The next prime is 7385540243. The reversal of 7385540209 is 9020455837.

7385540209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7195789584 + 189750625 = 84828^2 + 13775^2 .

It is an emirp because it is prime and its reverse (9020455837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7385540209 - 2⁵ = 7385540177 is a prime.

It is not a weakly prime, because it can be changed into another prime (7385540249) 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, 3692770104 + 3692770105.

It is an arithmetic number, because the mean of its divisors is an integer number (3692770105).

Almost surely, 2^7385540209 is an apocalyptic number.

It is an amenable number.

7385540209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7385540209 is an equidigital number, since it uses as much as digits as its factorization.

7385540209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 7385540209 is about 85939.1657453108. The cubic root of 7385540209 is about 1947.4250658690.

The spelling of 7385540209 in words is "seven billion, three hundred eighty-five million, five hundred forty thousand, two hundred nine".