199910999 has 8 divisors (see below), whose sum is σ = 206862480. Its totient is φ = 193064256.

The previous prime is 199910993. The next prime is 199911031. The reversal of 199910999 is 999019991.

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

It is a cyclic number.

It is not a de Polignac number, because 199910999 - 2¹⁶ = 199845463 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 (199910993) 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 7 ways as a sum of consecutive naturals, for example, 22292 + ... + 29945.

It is an arithmetic number, because the mean of its divisors is an integer number (25857810).

Almost surely, 2^199910999 is an apocalyptic number.

199910999 is a deficient number, since it is larger than the sum of its proper divisors (6951481).

199910999 is an equidigital number, since it uses as much as digits as its factorization.

199910999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52369.

The product of its (nonzero) digits is 531441, while the sum is 56.

The square root of 199910999 is about 14138.9886130515. The cubic root of 199910999 is about 584.7167879376.

The spelling of 199910999 in words is "one hundred ninety-nine million, nine hundred ten thousand, nine hundred ninety-nine".