199998247 has 2 divisors, whose sum is σ = 199998248. Its totient is φ = 199998246.

The previous prime is 199998241. The next prime is 199998347. The reversal of 199998247 is 742899991.

It is a weak prime.

It is an emirp because it is prime and its reverse (742899991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199998247 - 2¹⁹ = 199473959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199998191 and 199998200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199998241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999123 + 99999124.

It is an arithmetic number, because the mean of its divisors is an integer number (99999124).

Almost surely, 2^199998247 is an apocalyptic number.

199998247 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998247 is an equidigital number, since it uses as much as digits as its factorization.

199998247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 58.

The square root of 199998247 is about 14142.0736456858. The cubic root of 199998247 is about 584.8018390365.

The spelling of 199998247 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred forty-seven".