199940217 has 4 divisors (see below), whose sum is σ = 266586960. Its totient is φ = 133293476.

The previous prime is 199940177. The next prime is 199940233. The reversal of 199940217 is 712049991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199940217 - 2¹¹ = 199938169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199940017) 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, 33323367 + ... + 33323372.

It is an arithmetic number, because the mean of its divisors is an integer number (66646740).

Almost surely, 2^199940217 is an apocalyptic number.

It is an amenable number.

199940217 is a deficient number, since it is larger than the sum of its proper divisors (66646743).

199940217 is an equidigital number, since it uses as much as digits as its factorization.

199940217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66646742.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 199940217 is about 14140.0218175221. The cubic root of 199940217 is about 584.7452729850.

The spelling of 199940217 in words is "one hundred ninety-nine million, nine hundred forty thousand, two hundred seventeen".