18391920089 has 8 divisors (see below), whose sum is σ = 19028429760. Its totient is φ = 17755564176.

The previous prime is 18391920073. The next prime is 18391920109. The reversal of 18391920089 is 98002919381.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18391920089 - 2⁴ = 18391920073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18391920049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238964 + ... + 306410.

It is an arithmetic number, because the mean of its divisors is an integer number (2378553720).

Almost surely, 2^18391920089 is an apocalyptic number.

It is an amenable number.

18391920089 is a deficient number, since it is larger than the sum of its proper divisors (636509671).

18391920089 is an equidigital number, since it uses as much as digits as its factorization.

18391920089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76879.

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 18391920089 in words is "eighteen billion, three hundred ninety-one million, nine hundred twenty thousand, eighty-nine".