199445839 has 2 divisors, whose sum is σ = 199445840. Its totient is φ = 199445838.

The previous prime is 199445821. The next prime is 199445843. The reversal of 199445839 is 938544991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199445839 - 2⁹ = 199445327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199445879) 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, 99722919 + 99722920.

It is an arithmetic number, because the mean of its divisors is an integer number (99722920).

Almost surely, 2^199445839 is an apocalyptic number.

199445839 is a deficient number, since it is larger than the sum of its proper divisors (1).

199445839 is an equidigital number, since it uses as much as digits as its factorization.

199445839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 199445839 is about 14122.5294830636. The cubic root of 199445839 is about 584.2629224811.

The spelling of 199445839 in words is "one hundred ninety-nine million, four hundred forty-five thousand, eight hundred thirty-nine".