199999967 has 4 divisors (see below), whose sum is σ = 200180136. Its totient is φ = 199819800.

The previous prime is 199999963. The next prime is 199999991. The reversal of 199999967 is 769999991.

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 199999967 - 2² = 199999963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199999897 and 199999906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88409 + ... + 90642.

It is an arithmetic number, because the mean of its divisors is an integer number (50045034).

Almost surely, 2^199999967 is an apocalyptic number.

199999967 is a deficient number, since it is larger than the sum of its proper divisors (180169).

199999967 is a wasteful number, since it uses less digits than its factorization.

199999967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180168.

The product of its digits is 22320522, while the sum is 68.

The square root of 199999967 is about 14142.1344570047. The cubic root of 199999967 is about 584.8035154784.

The spelling of 199999967 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-seven".