18988793 has 2 divisors, whose sum is σ = 18988794. Its totient is φ = 18988792.

The previous prime is 18988769. The next prime is 18988811. The reversal of 18988793 is 39788981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 5053504 = 3733^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 18988793 - 2⁶ = 18988729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18988763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494396 + 9494397.

It is an arithmetic number, because the mean of its divisors is an integer number (9494397).

Almost surely, 2^18988793 is an apocalyptic number.

It is an amenable number.

18988793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18988793 is an equidigital number, since it uses as much as digits as its factorization.

18988793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 18988793 is about 4357.6132228549. The cubic root of 18988793 is about 266.7876900320.

The spelling of 18988793 in words is "eighteen million, nine hundred eighty-eight thousand, seven hundred ninety-three".