199645223 has 4 divisors (see below), whose sum is σ = 203412168. Its totient is φ = 195878280.

The previous prime is 199645213. The next prime is 199645231. The reversal of 199645223 is 322546991.

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 199645223 - 2¹⁰ = 199644199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199645213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1883393 + ... + 1883498.

It is an arithmetic number, because the mean of its divisors is an integer number (50853042).

Almost surely, 2^199645223 is an apocalyptic number.

199645223 is a deficient number, since it is larger than the sum of its proper divisors (3766945).

199645223 is an equidigital number, since it uses as much as digits as its factorization.

199645223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766944.

The product of its digits is 116640, while the sum is 41.

The square root of 199645223 is about 14129.5867950906. The cubic root of 199645223 is about 584.4575515624.

The spelling of 199645223 in words is "one hundred ninety-nine million, six hundred forty-five thousand, two hundred twenty-three".