18364219 has 2 divisors, whose sum is σ = 18364220. Its totient is φ = 18364218.

The previous prime is 18364217. The next prime is 18364253. The reversal of 18364219 is 91246381.

It is an a-pointer prime, because the next prime (18364253) can be obtained adding 18364219 to its sum of digits (34).

It is a weak prime.

It is an emirp because it is prime and its reverse (91246381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18364219 - 2¹ = 18364217 is a prime.

It is a super-2 number, since 2×18364219² = 674489078959922, which contains 22 as substring.

Together with 18364217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18364217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182109 + 9182110.

It is an arithmetic number, because the mean of its divisors is an integer number (9182110).

Almost surely, 2^18364219 is an apocalyptic number.

18364219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364219 is an equidigital number, since it uses as much as digits as its factorization.

18364219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 18364219 is about 4285.3493439859. The cubic root of 18364219 is about 263.8299859980.

The spelling of 18364219 in words is "eighteen million, three hundred sixty-four thousand, two hundred nineteen".