199808967 has 4 divisors (see below), whose sum is σ = 266411960. Its totient is φ = 133205976.

The previous prime is 199808963. The next prime is 199808969. The reversal of 199808967 is 769808991.

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

It is not a de Polignac number, because 199808967 - 2² = 199808963 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 (199808963) 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, 33301492 + ... + 33301497.

It is an arithmetic number, because the mean of its divisors is an integer number (66602990).

Almost surely, 2^199808967 is an apocalyptic number.

199808967 is a deficient number, since it is larger than the sum of its proper divisors (66602993).

199808967 is an equidigital number, since it uses as much as digits as its factorization.

199808967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66602992.

The product of its (nonzero) digits is 1959552, while the sum is 57.

The square root of 199808967 is about 14135.3799736689. The cubic root of 199808967 is about 584.6172937020.

The spelling of 199808967 in words is "one hundred ninety-nine million, eight hundred eight thousand, nine hundred sixty-seven".