199964459 has 2 divisors, whose sum is σ = 199964460. Its totient is φ = 199964458.

The previous prime is 199964449. The next prime is 199964473. The reversal of 199964459 is 954469991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199964459 - 2²⁴ = 183187243 is a prime.

It is not a weakly prime, because it can be changed into another prime (199964419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99982229 + 99982230.

It is an arithmetic number, because the mean of its divisors is an integer number (99982230).

Almost surely, 2^199964459 is an apocalyptic number.

199964459 is a deficient number, since it is larger than the sum of its proper divisors (1).

199964459 is an equidigital number, since it uses as much as digits as its factorization.

199964459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 56.

The square root of 199964459 is about 14140.8790037961. The cubic root of 199964459 is about 584.7689047523.

The spelling of 199964459 in words is "one hundred ninety-nine million, nine hundred sixty-four thousand, four hundred fifty-nine".