199989371 has 4 divisors (see below), whose sum is σ = 204244512. Its totient is φ = 195734232.

The previous prime is 199989367. The next prime is 199989373. The reversal of 199989371 is 173989991.

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 199989371 - 2² = 199989367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199989373) 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, 2127500 + ... + 2127593.

It is an arithmetic number, because the mean of its divisors is an integer number (51061128).

Almost surely, 2^199989371 is an apocalyptic number.

199989371 is a deficient number, since it is larger than the sum of its proper divisors (4255141).

199989371 is an equidigital number, since it uses as much as digits as its factorization.

199989371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255140.

The product of its digits is 1102248, while the sum is 56.

The square root of 199989371 is about 14141.7598268391. The cubic root of 199989371 is about 584.7931876642.

The spelling of 199989371 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, three hundred seventy-one".