199668243 has 8 divisors (see below), whose sum is σ = 273419728. Its totient is φ = 129514464.

The previous prime is 199668233. The next prime is 199668251. The reversal of 199668243 is 342866991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199668243 - 2⁵ = 199668211 is a prime.

It is a super-3 number, since 3×199668243³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199668192 and 199668201.

It is not an unprimeable number, because it can be changed into a prime (199668223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899296 + ... + 899517.

It is an arithmetic number, because the mean of its divisors is an integer number (34177466).

Almost surely, 2^199668243 is an apocalyptic number.

199668243 is a deficient number, since it is larger than the sum of its proper divisors (73751485).

199668243 is a wasteful number, since it uses less digits than its factorization.

199668243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798853.

The product of its digits is 559872, while the sum is 48.

The square root of 199668243 is about 14130.4013743418. The cubic root of 199668243 is about 584.4800142349.

The spelling of 199668243 in words is "one hundred ninety-nine million, six hundred sixty-eight thousand, two hundred forty-three".