18230213 has 2 divisors, whose sum is σ = 18230214. Its totient is φ = 18230212.

The previous prime is 18230209. The next prime is 18230227. The reversal of 18230213 is 31203281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 1444804 = 4097^2 + 1202^2 .

It is a cyclic number.

It is not a de Polignac number, because 18230213 - 2² = 18230209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18230293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9115106 + 9115107.

It is an arithmetic number, because the mean of its divisors is an integer number (9115107).

Almost surely, 2^18230213 is an apocalyptic number.

It is an amenable number.

18230213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18230213 is an equidigital number, since it uses as much as digits as its factorization.

18230213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18230213 is about 4269.6853514047. The cubic root of 18230213 is about 263.1866852480.

Adding to 18230213 its reverse (31203281), we get a palindrome (49433494).

The spelling of 18230213 in words is "eighteen million, two hundred thirty thousand, two hundred thirteen".