18945894389 has 8 divisors (see below), whose sum is σ = 18992918880. Its totient is φ = 18898898416.

The previous prime is 18945894379. The next prime is 18945894391. The reversal of 18945894389 is 98349854981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18945894389 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945894379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1981382 + ... + 1990920.

It is an arithmetic number, because the mean of its divisors is an integer number (2374114860).

Almost surely, 2^18945894389 is an apocalyptic number.

It is an amenable number.

18945894389 is a deficient number, since it is larger than the sum of its proper divisors (47024491).

18945894389 is an equidigital number, since it uses as much as digits as its factorization.

18945894389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14259.

The product of its digits is 89579520, while the sum is 68.

The spelling of 18945894389 in words is "eighteen billion, nine hundred forty-five million, eight hundred ninety-four thousand, three hundred eighty-nine".