18388383399 has 20 divisors (see below), whose sum is σ = 27845364096. Its totient is φ = 12090987936.

The previous prime is 18388383373. The next prime is 18388383451. The reversal of 18388383399 is 99338388381.

It is not a de Polignac number, because 18388383399 - 2⁷ = 18388383271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388383329) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1548999 + ... + 1560824.

Almost surely, 2^18388383399 is an apocalyptic number.

18388383399 is a deficient number, since it is larger than the sum of its proper divisors (9456980697).

18388383399 is an equidigital number, since it uses as much as digits as its factorization.

18388383399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109908 (or 3109899 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 18388383399 in words is "eighteen billion, three hundred eighty-eight million, three hundred eighty-three thousand, three hundred ninety-nine".