999843223 has 2 divisors, whose sum is σ = 999843224. Its totient is φ = 999843222.

The previous prime is 999843209. The next prime is 999843227. The reversal of 999843223 is 322348999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999843223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999843227) 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, 499921611 + 499921612.

It is an arithmetic number, because the mean of its divisors is an integer number (499921612).

Almost surely, 2^999843223 is an apocalyptic number.

999843223 is a deficient number, since it is larger than the sum of its proper divisors (1).

999843223 is an equidigital number, since it uses as much as digits as its factorization.

999843223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 49.

The square root of 999843223 is about 31620.2976424954. The cubic root of 999843223 is about 999.9477382688.

The spelling of 999843223 in words is "nine hundred ninety-nine million, eight hundred forty-three thousand, two hundred twenty-three".