18839893939 has 2 divisors, whose sum is σ = 18839893940. Its totient is φ = 18839893938.

The previous prime is 18839893871. The next prime is 18839893997. The reversal of 18839893939 is 93939893881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18839893939 - 2¹⁹ = 18839369651 is a prime.

It is not a weakly prime, because it can be changed into another prime (18839893139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419946969 + 9419946970.

It is an arithmetic number, because the mean of its divisors is an integer number (9419946970).

Almost surely, 2^18839893939 is an apocalyptic number.

18839893939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839893939 is an equidigital number, since it uses as much as digits as its factorization.

18839893939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90699264, while the sum is 70.

The spelling of 18839893939 in words is "eighteen billion, eight hundred thirty-nine million, eight hundred ninety-three thousand, nine hundred thirty-nine".