1818199 has 2 divisors, whose sum is σ = 1818200. Its totient is φ = 1818198.

The previous prime is 1818163. The next prime is 1818209. The reversal of 1818199 is 9918181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1818199 - 2⁹ = 1817687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818109) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909099 + 909100.

It is an arithmetic number, because the mean of its divisors is an integer number (909100).

2^1818199 is an apocalyptic number.

1818199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818199 is an equidigital number, since it uses as much as digits as its factorization.

1818199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 37.

The square root of 1818199 is about 1348.4060961001. The cubic root of 1818199 is about 122.0526289104.

The spelling of 1818199 in words is "one million, eight hundred eighteen thousand, one hundred ninety-nine".