199844287 has 2 divisors, whose sum is σ = 199844288. Its totient is φ = 199844286.

The previous prime is 199844273. The next prime is 199844311. The reversal of 199844287 is 782448991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199844287 - 2⁷ = 199844159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199844087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99922143 + 99922144.

It is an arithmetic number, because the mean of its divisors is an integer number (99922144).

Almost surely, 2^199844287 is an apocalyptic number.

199844287 is a deficient number, since it is larger than the sum of its proper divisors (1).

199844287 is an equidigital number, since it uses as much as digits as its factorization.

199844287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 199844287 is about 14136.6292658469. The cubic root of 199844287 is about 584.6517390468.

The spelling of 199844287 in words is "one hundred ninety-nine million, eight hundred forty-four thousand, two hundred eighty-seven".