199846709 has 2 divisors, whose sum is σ = 199846710. Its totient is φ = 199846708.

The previous prime is 199846681. The next prime is 199846711. The reversal of 199846709 is 907648991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181656484 + 18190225 = 13478^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 199846709 - 2¹² = 199842613 is a prime.

It is a Sophie Germain prime.

Together with 199846711, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199846109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99923354 + 99923355.

It is an arithmetic number, because the mean of its divisors is an integer number (99923355).

Almost surely, 2^199846709 is an apocalyptic number.

It is an amenable number.

199846709 is a deficient number, since it is larger than the sum of its proper divisors (1).

199846709 is an equidigital number, since it uses as much as digits as its factorization.

199846709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 199846709 is about 14136.7149295726. The cubic root of 199846709 is about 584.6541009203.

The spelling of 199846709 in words is "one hundred ninety-nine million, eight hundred forty-six thousand, seven hundred nine".