18424213 has 2 divisors, whose sum is σ = 18424214. Its totient is φ = 18424212.

The previous prime is 18424201. The next prime is 18424229. The reversal of 18424213 is 31242481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 935089 = 4182^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 18424213 - 2⁵ = 18424181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18424313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212106 + 9212107.

It is an arithmetic number, because the mean of its divisors is an integer number (9212107).

Almost surely, 2^18424213 is an apocalyptic number.

It is an amenable number.

18424213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18424213 is an equidigital number, since it uses as much as digits as its factorization.

18424213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 18424213 is about 4292.3435323841. The cubic root of 18424213 is about 264.1169754422.

Adding to 18424213 its reverse (31242481), we get a palindrome (49666694).

The spelling of 18424213 in words is "eighteen million, four hundred twenty-four thousand, two hundred thirteen".