199934879 has 2 divisors, whose sum is σ = 199934880. Its totient is φ = 199934878.

The previous prime is 199934873. The next prime is 199934897. The reversal of 199934879 is 978439991.

Together with next prime (199934897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (978439991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199934879 - 2⁴ = 199934863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199934873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99967439 + 99967440.

It is an arithmetic number, because the mean of its divisors is an integer number (99967440).

Almost surely, 2^199934879 is an apocalyptic number.

199934879 is a deficient number, since it is larger than the sum of its proper divisors (1).

199934879 is an equidigital number, since it uses as much as digits as its factorization.

199934879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 199934879 is about 14139.8330612493. The cubic root of 199934879 is about 584.7400690994.

The spelling of 199934879 in words is "one hundred ninety-nine million, nine hundred thirty-four thousand, eight hundred seventy-nine".