18389974867 has 16 divisors (see below), whose sum is σ = 20522414592. Its totient is φ = 16335479520.

The previous prime is 18389974751. The next prime is 18389974871. The reversal of 18389974867 is 76847998381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18389974867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18389974796 and 18389974805.

It is not an unprimeable number, because it can be changed into a prime (18389974367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287908 + ... + 345934.

It is an arithmetic number, because the mean of its divisors is an integer number (1282650912).

Almost surely, 2^18389974867 is an apocalyptic number.

18389974867 is a deficient number, since it is larger than the sum of its proper divisors (2132439725).

18389974867 is a wasteful number, since it uses less digits than its factorization.

18389974867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58698.

The product of its digits is 146313216, while the sum is 70.

The spelling of 18389974867 in words is "eighteen billion, three hundred eighty-nine million, nine hundred seventy-four thousand, eight hundred sixty-seven".