18185243 has 4 divisors (see below), whose sum is σ = 18318120. Its totient is φ = 18052368.

The previous prime is 18185221. The next prime is 18185273. The reversal of 18185243 is 34258181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34258181 = 769 ⋅44549.

It is a cyclic number.

It is not a de Polignac number, because 18185243 - 2⁶ = 18185179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18185273) 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 3 ways as a sum of consecutive naturals, for example, 66233 + ... + 66506.

It is an arithmetic number, because the mean of its divisors is an integer number (4579530).

Almost surely, 2^18185243 is an apocalyptic number.

18185243 is a deficient number, since it is larger than the sum of its proper divisors (132877).

18185243 is a wasteful number, since it uses less digits than its factorization.

18185243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132876.

The product of its digits is 7680, while the sum is 32.

The square root of 18185243 is about 4264.4159037317. The cubic root of 18185243 is about 262.9700988140.

The spelling of 18185243 in words is "eighteen million, one hundred eighty-five thousand, two hundred forty-three".