18627238393 has 2 divisors, whose sum is σ = 18627238394. Its totient is φ = 18627238392.

The previous prime is 18627238381. The next prime is 18627238447. The reversal of 18627238393 is 39383272681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15728169744 + 2899068649 = 125412^2 + 53843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18627238393 - 2²⁹ = 18090367481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18627238393.

It is not a weakly prime, because it can be changed into another prime (18627238303) 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, 9313619196 + 9313619197.

It is an arithmetic number, because the mean of its divisors is an integer number (9313619197).

Almost surely, 2^18627238393 is an apocalyptic number.

It is an amenable number.

18627238393 is a deficient number, since it is larger than the sum of its proper divisors (1).

18627238393 is an equidigital number, since it uses as much as digits as its factorization.

18627238393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The spelling of 18627238393 in words is "eighteen billion, six hundred twenty-seven million, two hundred thirty-eight thousand, three hundred ninety-three".