199992399 has 4 divisors (see below), whose sum is σ = 266656536. Its totient is φ = 133328264.

The previous prime is 199992391. The next prime is 199992427. The reversal of 199992399 is 993299991.

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 199992399 - 2³ = 199992391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199992391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33332064 + ... + 33332069.

It is an arithmetic number, because the mean of its divisors is an integer number (66664134).

Almost surely, 2^199992399 is an apocalyptic number.

199992399 is a deficient number, since it is larger than the sum of its proper divisors (66664137).

199992399 is an equidigital number, since it uses as much as digits as its factorization.

199992399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66664136.

The product of its digits is 3188646, while the sum is 60.

The square root of 199992399 is about 14141.8668852454. The cubic root of 199992399 is about 584.7961390624.

The spelling of 199992399 in words is "one hundred ninety-nine million, nine hundred ninety-two thousand, three hundred ninety-nine".