18189045 has 72 divisors (see below), whose sum is σ = 37506456. Its totient is φ = 8128512.

The previous prime is 18189013. The next prime is 18189077. The reversal of 18189045 is 54098181.

It is an interprime number because it is at equal distance from previous prime (18189013) and next prime (18189077).

It can be written as a sum of positive squares in 4 ways, for example, as 15876 + 18173169 = 126^2 + 4263^2 .

It is not a de Polignac number, because 18189045 - 2⁵ = 18189013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 160909 + ... + 161021.

It is an arithmetic number, because the mean of its divisors is an integer number (520923).

Almost surely, 2^18189045 is an apocalyptic number.

18189045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18189045 is an abundant number, since it is smaller than the sum of its proper divisors (19317411).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18189045 is a wasteful number, since it uses less digits than its factorization.

18189045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18189045 is about 4264.8616624693. The cubic root of 18189045 is about 262.9884239774.

The spelling of 18189045 in words is "eighteen million, one hundred eighty-nine thousand, forty-five".