18938727017 has 24 divisors (see below), whose sum is σ = 22197551040. Its totient is φ = 16110618720.

The previous prime is 18938727013. The next prime is 18938727053. The reversal of 18938727017 is 71072783981.

It is not a de Polignac number, because 18938727017 - 2² = 18938727013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18938727017.

It is not an unprimeable number, because it can be changed into a prime (18938727013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6716834 + ... + 6719652.

It is an arithmetic number, because the mean of its divisors is an integer number (924897960).

Almost surely, 2^18938727017 is an apocalyptic number.

It is an amenable number.

18938727017 is a deficient number, since it is larger than the sum of its proper divisors (3258824023).

18938727017 is a wasteful number, since it uses less digits than its factorization.

18938727017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821 (or 3814 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 18938727017 in words is "eighteen billion, nine hundred thirty-eight million, seven hundred twenty-seven thousand, seventeen".