199770019 has 4 divisors (see below), whose sum is σ = 208455696. Its totient is φ = 191084344.

The previous prime is 199770013. The next prime is 199770031. The reversal of 199770019 is 910077991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199770019 - 2¹⁹ = 199245731 is a prime.

It is a super-2 number, since 2×199770019² = 79816120982520722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199770013) 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 in 3 ways as a sum of consecutive naturals, for example, 4342804 + ... + 4342849.

It is an arithmetic number, because the mean of its divisors is an integer number (52113924).

Almost surely, 2^199770019 is an apocalyptic number.

199770019 is a deficient number, since it is larger than the sum of its proper divisors (8685677).

199770019 is an equidigital number, since it uses as much as digits as its factorization.

199770019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685676.

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 199770019 is about 14134.0022286683. The cubic root of 199770019 is about 584.5793054937.

The spelling of 199770019 in words is "one hundred ninety-nine million, seven hundred seventy thousand, nineteen".