18222199 has 4 divisors (see below), whose sum is σ = 18232864. Its totient is φ = 18211536.

The previous prime is 18222173. The next prime is 18222223. The reversal of 18222199 is 99122281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99122281 = 463 ⋅214087.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18222199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18222109) 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, 2127 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (4558216).

Almost surely, 2^18222199 is an apocalyptic number.

18222199 is a deficient number, since it is larger than the sum of its proper divisors (10665).

18222199 is an equidigital number, since it uses as much as digits as its factorization.

18222199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10664.

The product of its digits is 5184, while the sum is 34.

The square root of 18222199 is about 4268.7467715947. The cubic root of 18222199 is about 263.1481139810.

The spelling of 18222199 in words is "eighteen million, two hundred twenty-two thousand, one hundred ninety-nine".