199297823 has 2 divisors, whose sum is σ = 199297824. Its totient is φ = 199297822.

The previous prime is 199297807. The next prime is 199297837. The reversal of 199297823 is 328792991.

It is a strong prime.

It is an emirp because it is prime and its reverse (328792991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199297823 - 2⁴ = 199297807 is a prime.

It is a super-3 number, since 3×199297823³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199297223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99648911 + 99648912.

It is an arithmetic number, because the mean of its divisors is an integer number (99648912).

Almost surely, 2^199297823 is an apocalyptic number.

199297823 is a deficient number, since it is larger than the sum of its proper divisors (1).

199297823 is an equidigital number, since it uses as much as digits as its factorization.

199297823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 199297823 is about 14117.2880894313. The cubic root of 199297823 is about 584.1183524676.

The spelling of 199297823 in words is "one hundred ninety-nine million, two hundred ninety-seven thousand, eight hundred twenty-three".