199941823 has 2 divisors, whose sum is σ = 199941824. Its totient is φ = 199941822.

The previous prime is 199941803. The next prime is 199941853. The reversal of 199941823 is 328149991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199941823 - 2⁹ = 199941311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199941803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99970911 + 99970912.

It is an arithmetic number, because the mean of its divisors is an integer number (99970912).

Almost surely, 2^199941823 is an apocalyptic number.

199941823 is a deficient number, since it is larger than the sum of its proper divisors (1).

199941823 is an equidigital number, since it uses as much as digits as its factorization.

199941823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 199941823 is about 14140.0786065708. The cubic root of 199941823 is about 584.7468386170.

The spelling of 199941823 in words is "one hundred ninety-nine million, nine hundred forty-one thousand, eight hundred twenty-three".