18927019439 has 2 divisors, whose sum is σ = 18927019440. Its totient is φ = 18927019438.

The previous prime is 18927019417. The next prime is 18927019451. The reversal of 18927019439 is 93491072981.

It is a strong prime.

It is an emirp because it is prime and its reverse (93491072981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18927019439 - 2²⁰ = 18925970863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18927019459) 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, 9463509719 + 9463509720.

It is an arithmetic number, because the mean of its divisors is an integer number (9463509720).

Almost surely, 2^18927019439 is an apocalyptic number.

18927019439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18927019439 is an equidigital number, since it uses as much as digits as its factorization.

18927019439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 18927019439 in words is "eighteen billion, nine hundred twenty-seven million, nineteen thousand, four hundred thirty-nine".