199996409 has 2 divisors, whose sum is σ = 199996410. Its totient is φ = 199996408.

The previous prime is 199996403. The next prime is 199996417. The reversal of 199996409 is 904699991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195916009 + 4080400 = 13997^2 + 2020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199996409 is a prime.

It is a super-2 number, since 2×199996409² = 79997127225790562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199996403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99998204 + 99998205.

It is an arithmetic number, because the mean of its divisors is an integer number (99998205).

Almost surely, 2^199996409 is an apocalyptic number.

It is an amenable number.

199996409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199996409 is an equidigital number, since it uses as much as digits as its factorization.

199996409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 199996409 is about 14142.0086621385. The cubic root of 199996409 is about 584.8000475724.

The spelling of 199996409 in words is "one hundred ninety-nine million, nine hundred ninety-six thousand, four hundred nine".