18045005 has 16 divisors (see below), whose sum is σ = 23960448. Its totient is φ = 12936000.

The previous prime is 18044981. The next prime is 18045019. The reversal of 18045005 is 50054081.

It is not a de Polignac number, because 18045005 - 2⁶ = 18044941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1595 + ... + 6215.

It is an arithmetic number, because the mean of its divisors is an integer number (1497528).

Almost surely, 2^18045005 is an apocalyptic number.

It is an amenable number.

18045005 is a deficient number, since it is larger than the sum of its proper divisors (5915443).

18045005 is a wasteful number, since it uses less digits than its factorization.

18045005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 18045005 is about 4247.9412660723. The cubic root of 18045005 is about 262.2923770193.

Adding to 18045005 its sum of digits (23), we get a triangular number (18045028 = T₆₀₀₇).

Adding to 18045005 its reverse (50054081), we get a palindrome (68099086).

The spelling of 18045005 in words is "eighteen million, forty-five thousand, five".