18422219 has 4 divisors (see below), whose sum is σ = 18734520. Its totient is φ = 18109920.

The previous prime is 18422213. The next prime is 18422231. The reversal of 18422219 is 91222481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91222481 = 7 ⋅13031783.

It is a cyclic number.

It is not a de Polignac number, because 18422219 - 2¹⁶ = 18356683 is a prime.

It is a super-3 number, since 3×18422219³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18422191 and 18422200.

It is not an unprimeable number, because it can be changed into a prime (18422213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156062 + ... + 156179.

It is an arithmetic number, because the mean of its divisors is an integer number (4683630).

Almost surely, 2^18422219 is an apocalyptic number.

18422219 is a deficient number, since it is larger than the sum of its proper divisors (312301).

18422219 is an equidigital number, since it uses as much as digits as its factorization.

18422219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312300.

The product of its digits is 2304, while the sum is 29.

The square root of 18422219 is about 4292.1112520530. Note that the first 3 decimals coincide. The cubic root of 18422219 is about 264.1074468896.

The spelling of 18422219 in words is "eighteen million, four hundred twenty-two thousand, two hundred nineteen".