18284219 has 2 divisors, whose sum is σ = 18284220. Its totient is φ = 18284218.

The previous prime is 18284171. The next prime is 18284257. The reversal of 18284219 is 91248281.

It is a strong prime.

It is an emirp because it is prime and its reverse (91248281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18284219 is a prime.

It is a super-2 number, since 2×18284219² = 668625328879922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18284419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9142109 + 9142110.

It is an arithmetic number, because the mean of its divisors is an integer number (9142110).

Almost surely, 2^18284219 is an apocalyptic number.

18284219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18284219 is an equidigital number, since it uses as much as digits as its factorization.

18284219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 18284219 is about 4276.0050280607. The cubic root of 18284219 is about 263.4463210414.

The spelling of 18284219 in words is "eighteen million, two hundred eighty-four thousand, two hundred nineteen".