18018243 has 12 divisors (see below), whose sum is σ = 26415688. Its totient is φ = 11832480.

The previous prime is 18018239. The next prime is 18018263. The reversal of 18018243 is 34281081.

It is not a de Polignac number, because 18018243 - 2² = 18018239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18018233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14338 + ... + 15543.

Almost surely, 2^18018243 is an apocalyptic number.

18018243 is a deficient number, since it is larger than the sum of its proper divisors (8397445).

18018243 is a wasteful number, since it uses less digits than its factorization.

18018243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29954 (or 29951 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18018243 is about 4244.7901008177. The cubic root of 18018243 is about 262.1626469069.

The spelling of 18018243 in words is "eighteen million, eighteen thousand, two hundred forty-three".