1800199 has 2 divisors, whose sum is σ = 1800200. Its totient is φ = 1800198.

The previous prime is 1800191. The next prime is 1800209. The reversal of 1800199 is 9910081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1800199 - 2³ = 1800191 is a prime.

1800199 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900099 + 900100.

It is an arithmetic number, because the mean of its divisors is an integer number (900100).

2^1800199 is an apocalyptic number.

1800199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800199 is an equidigital number, since it uses as much as digits as its factorization.

1800199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1800199 is about 1341.7149473715. The cubic root of 1800199 is about 121.6485225544.

The spelling of 1800199 in words is "one million, eight hundred thousand, one hundred ninety-nine".