18193920039 has 12 divisors (see below), whose sum is σ = 26287512472. Its totient is φ = 12125862000.

The previous prime is 18193919971. The next prime is 18193920077. The reversal of 18193920039 is 93002939181.

It is a happy number.

It is not a de Polignac number, because 18193920039 - 2¹¹ = 18193917991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18193919976 and 18193920003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18193920439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250912 + ... + 315189.

Almost surely, 2^18193920039 is an apocalyptic number.

18193920039 is a deficient number, since it is larger than the sum of its proper divisors (8093592433).

18193920039 is a wasteful number, since it uses less digits than its factorization.

18193920039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569678 (or 569675 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 18193920039 in words is "eighteen billion, one hundred ninety-three million, nine hundred twenty thousand, thirty-nine".