199966238 has 4 divisors (see below), whose sum is σ = 299949360. Its totient is φ = 99983118.

The previous prime is 199966183. The next prime is 199966253. The reversal of 199966238 is 832669991.

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

It is a self number, because there is not a number n which added to its sum of digits gives 199966238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49991558 + ... + 49991561.

It is an arithmetic number, because the mean of its divisors is an integer number (74987340).

Almost surely, 2^199966238 is an apocalyptic number.

199966238 is a deficient number, since it is larger than the sum of its proper divisors (99983122).

199966238 is an equidigital number, since it uses as much as digits as its factorization.

199966238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99983121.

The product of its digits is 1259712, while the sum is 53.

The square root of 199966238 is about 14140.9419063936. The cubic root of 199966238 is about 584.7706388951.

The spelling of 199966238 in words is "one hundred ninety-nine million, nine hundred sixty-six thousand, two hundred thirty-eight".