18045786 has 32 divisors (see below), whose sum is σ = 39937536. Its totient is φ = 5390000.

The previous prime is 18045773. The next prime is 18045787. The reversal of 18045786 is 68754081.

It is not an unprimeable number, because it can be changed into a prime (18045787) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2761 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1248048).

Almost surely, 2^18045786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18045786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19968768).

18045786 is an abundant number, since it is smaller than the sum of its proper divisors (21891750).

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

18045786 is a wasteful number, since it uses less digits than its factorization.

18045786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 18045786 is about 4248.0331919607. The cubic root of 18045786 is about 262.2961610284.

The spelling of 18045786 in words is "eighteen million, forty-five thousand, seven hundred eighty-six".