18045973 has 16 divisors (see below), whose sum is σ = 20465280. Its totient is φ = 15768000.

The previous prime is 18045971. The next prime is 18045983. The reversal of 18045973 is 37954081.

It is a cyclic number.

It is not a de Polignac number, because 18045973 - 2¹ = 18045971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045971) 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 15 ways as a sum of consecutive naturals, for example, 40888 + ... + 41326.

It is an arithmetic number, because the mean of its divisors is an integer number (1279080).

Almost surely, 2^18045973 is an apocalyptic number.

It is an amenable number.

18045973 is a deficient number, since it is larger than the sum of its proper divisors (2419307).

18045973 is a wasteful number, since it uses less digits than its factorization.

18045973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 18045973 is about 4248.0552020895. The cubic root of 18045973 is about 262.2970670425.

It can be divided in two parts, 1804 and 5973, that added together give a palindrome (7777).

The spelling of 18045973 in words is "eighteen million, forty-five thousand, nine hundred seventy-three".