18030211 has 4 divisors (see below), whose sum is σ = 18517552. Its totient is φ = 17542872.

The previous prime is 18030203. The next prime is 18030227. The reversal of 18030211 is 11203081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18030211 - 2³ = 18030203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18030241) 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 3 ways as a sum of consecutive naturals, for example, 243615 + ... + 243688.

It is an arithmetic number, because the mean of its divisors is an integer number (4629388).

Almost surely, 2^18030211 is an apocalyptic number.

18030211 is a deficient number, since it is larger than the sum of its proper divisors (487341).

18030211 is an equidigital number, since it uses as much as digits as its factorization.

18030211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487340.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18030211 is about 4246.1995949319. The cubic root of 18030211 is about 262.2206782430.

Adding to 18030211 its reverse (11203081), we get a palindrome (29233292).

The spelling of 18030211 in words is "eighteen million, thirty thousand, two hundred eleven".