199989859 has 2 divisors, whose sum is σ = 199989860. Its totient is φ = 199989858.

The previous prime is 199989857. The next prime is 199989883. The reversal of 199989859 is 958989991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199989859 - 2¹ = 199989857 is a prime.

Together with 199989857, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 199989794 and 199989803.

It is not a weakly prime, because it can be changed into another prime (199989857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994929 + 99994930.

It is an arithmetic number, because the mean of its divisors is an integer number (99994930).

Almost surely, 2^199989859 is an apocalyptic number.

199989859 is a deficient number, since it is larger than the sum of its proper divisors (1).

199989859 is an equidigital number, since it uses as much as digits as its factorization.

199989859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 67.

The square root of 199989859 is about 14141.7770806925. Note that the first 3 decimals coincide. The cubic root of 199989859 is about 584.7936633209.

The spelling of 199989859 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred fifty-nine".