199970218 has 32 divisors (see below), whose sum is σ = 365472000. Its totient is φ = 80104704.

The previous prime is 199970213. The next prime is 199970227. The reversal of 199970218 is 812079991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (199970213) 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 15 ways as a sum of consecutive naturals, for example, 32643 + ... + 38281.

It is an arithmetic number, because the mean of its divisors is an integer number (11421000).

Almost surely, 2^199970218 is an apocalyptic number.

199970218 is a deficient number, since it is larger than the sum of its proper divisors (165501782).

199970218 is a wasteful number, since it uses less digits than its factorization.

199970218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 199970218 is about 14141.0826318214. The cubic root of 199970218 is about 584.7745185029.

The spelling of 199970218 in words is "one hundred ninety-nine million, nine hundred seventy thousand, two hundred eighteen".