18228299 has 2 divisors, whose sum is σ = 18228300. Its totient is φ = 18228298.

The previous prime is 18228293. The next prime is 18228307. The reversal of 18228299 is 99282281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18228299 - 2²⁴ = 1451083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18228293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114149 + 9114150.

It is an arithmetic number, because the mean of its divisors is an integer number (9114150).

Almost surely, 2^18228299 is an apocalyptic number.

18228299 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228299 is an equidigital number, since it uses as much as digits as its factorization.

18228299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 18228299 is about 4269.4612072251. The cubic root of 18228299 is about 263.1774742211.

The spelling of 18228299 in words is "eighteen million, two hundred twenty-eight thousand, two hundred ninety-nine".