18945089 has 16 divisors (see below), whose sum is σ = 20756736. Its totient is φ = 17222400.

The previous prime is 18945083. The next prime is 18945103. The reversal of 18945089 is 98054981.

It is a cyclic number.

It is not a de Polignac number, because 18945089 - 2¹² = 18940993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104579 + ... + 104759.

It is an arithmetic number, because the mean of its divisors is an integer number (1297296).

Almost surely, 2^18945089 is an apocalyptic number.

It is an amenable number.

18945089 is a deficient number, since it is larger than the sum of its proper divisors (1811647).

18945089 is a wasteful number, since it uses less digits than its factorization.

18945089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18945089 is about 4352.5956623606. The cubic root of 18945089 is about 266.5828561273.

The spelling of 18945089 in words is "eighteen million, nine hundred forty-five thousand, eighty-nine".