199727243 has 2 divisors, whose sum is σ = 199727244. Its totient is φ = 199727242.

The previous prime is 199727207. The next prime is 199727251. The reversal of 199727243 is 342727991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199727243 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 199727194 and 199727203.

It is not a weakly prime, because it can be changed into another prime (199720243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99863621 + 99863622.

It is an arithmetic number, because the mean of its divisors is an integer number (99863622).

Almost surely, 2^199727243 is an apocalyptic number.

199727243 is a deficient number, since it is larger than the sum of its proper divisors (1).

199727243 is an equidigital number, since it uses as much as digits as its factorization.

199727243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 199727243 is about 14132.4889173847. The cubic root of 199727243 is about 584.5375779287.

The spelling of 199727243 in words is "one hundred ninety-nine million, seven hundred twenty-seven thousand, two hundred forty-three".