18309640939 has 2 divisors, whose sum is σ = 18309640940. Its totient is φ = 18309640938.

The previous prime is 18309640931. The next prime is 18309640961. The reversal of 18309640939 is 93904690381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18309640939 - 2³ = 18309640931 is a prime.

It is not a weakly prime, because it can be changed into another prime (18309640931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154820469 + 9154820470.

It is an arithmetic number, because the mean of its divisors is an integer number (9154820470).

Almost surely, 2^18309640939 is an apocalyptic number.

18309640939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309640939 is an equidigital number, since it uses as much as digits as its factorization.

18309640939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 18309640939 in words is "eighteen billion, three hundred nine million, six hundred forty thousand, nine hundred thirty-nine".