18799974839 has 2 divisors, whose sum is σ = 18799974840. Its totient is φ = 18799974838.

The previous prime is 18799974749. The next prime is 18799974857. The reversal of 18799974839 is 93847999781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18799974839 - 2²⁴ = 18783197623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18799974889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9399987419 + 9399987420.

It is an arithmetic number, because the mean of its divisors is an integer number (9399987420).

Almost surely, 2^18799974839 is an apocalyptic number.

18799974839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18799974839 is an equidigital number, since it uses as much as digits as its factorization.

18799974839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246903552, while the sum is 74.

The spelling of 18799974839 in words is "eighteen billion, seven hundred ninety-nine million, nine hundred seventy-four thousand, eight hundred thirty-nine".