18919089 has 40 divisors (see below), whose sum is σ = 32888768. Its totient is φ = 10614240.

The previous prime is 18919067. The next prime is 18919091. The reversal of 18919089 is 98091981.

It is not a de Polignac number, because 18919089 - 2⁵ = 18919057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18919189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34314 + ... + 34860.

Almost surely, 2^18919089 is an apocalyptic number.

It is an amenable number.

18919089 is a deficient number, since it is larger than the sum of its proper divisors (13969679).

18919089 is an equidigital number, since it uses as much as digits as its factorization.

18919089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 18919089 is about 4349.6079133641. The cubic root of 18919089 is about 266.4608486522.

The spelling of 18919089 in words is "eighteen million, nine hundred nineteen thousand, eighty-nine".