199789441 has 4 divisors (see below), whose sum is σ = 199822084. Its totient is φ = 199756800.

The previous prime is 199789417. The next prime is 199789453. The reversal of 199789441 is 144987991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26998416 + 172791025 = 5196^2 + 13145^2 .

It is a 3-Lehmer number, since φ(199789441) divides (199789441-1)³.

It is a cyclic number.

It is not a de Polignac number, because 199789441 - 2¹⁷ = 199658369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199789741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080 + ... + 20401.

It is an arithmetic number, because the mean of its divisors is an integer number (49955521).

Almost surely, 2^199789441 is an apocalyptic number.

199789441 is the 8161-st octagonal number.

It is an amenable number.

199789441 is a deficient number, since it is larger than the sum of its proper divisors (32643).

199789441 is an equidigital number, since it uses as much as digits as its factorization.

199789441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32642.

The product of its digits is 653184, while the sum is 52.

The square root of 199789441 is about 14134.6892785091. The cubic root of 199789441 is about 584.5982494964.

The spelling of 199789441 in words is "one hundred ninety-nine million, seven hundred eighty-nine thousand, four hundred forty-one".