18428213 has 2 divisors, whose sum is σ = 18428214. Its totient is φ = 18428212.

The previous prime is 18428197. The next prime is 18428227. The reversal of 18428213 is 31282481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13490929 + 4937284 = 3673^2 + 2222^2 .

It is an emirp because it is prime and its reverse (31282481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18428213 - 2⁴ = 18428197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428273) 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 as a sum of consecutive naturals, namely, 9214106 + 9214107.

It is an arithmetic number, because the mean of its divisors is an integer number (9214107).

Almost surely, 2^18428213 is an apocalyptic number.

It is an amenable number.

18428213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428213 is an equidigital number, since it uses as much as digits as its factorization.

18428213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 18428213 is about 4292.8094530272. The cubic root of 18428213 is about 264.1360878182.

The spelling of 18428213 in words is "eighteen million, four hundred twenty-eight thousand, two hundred thirteen".