18185345 has 16 divisors (see below), whose sum is σ = 22885632. Its totient is φ = 13856640.

The previous prime is 18185333. The next prime is 18185347. The reversal of 18185345 is 54358181.

It is not a de Polignac number, because 18185345 - 2⁴ = 18185329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18185347) 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, 7784 + ... + 9846.

It is an arithmetic number, because the mean of its divisors is an integer number (1430352).

Almost surely, 2^18185345 is an apocalyptic number.

It is an amenable number.

18185345 is a deficient number, since it is larger than the sum of its proper divisors (4700287).

18185345 is a wasteful number, since it uses less digits than its factorization.

18185345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152.

The product of its digits is 19200, while the sum is 35.

The square root of 18185345 is about 4264.4278631488. The cubic root of 18185345 is about 262.9705904746.

The spelling of 18185345 in words is "eighteen million, one hundred eighty-five thousand, three hundred forty-five".