999805043 has 2 divisors, whose sum is σ = 999805044. Its totient is φ = 999805042.

The previous prime is 999804937. The next prime is 999805057. The reversal of 999805043 is 340508999.

It is a strong prime.

It is an emirp because it is prime and its reverse (340508999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999805043 - 2¹⁰ = 999804019 is a prime.

It is a super-2 number, since 2×999805043² = 1999220248016463698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999805063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499902521 + 499902522.

It is an arithmetic number, because the mean of its divisors is an integer number (499902522).

Almost surely, 2^999805043 is an apocalyptic number.

999805043 is a deficient number, since it is larger than the sum of its proper divisors (1).

999805043 is an equidigital number, since it uses as much as digits as its factorization.

999805043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 999805043 is about 31619.6939105995. The cubic root of 999805043 is about 999.9350101097.

The spelling of 999805043 in words is "nine hundred ninety-nine million, eight hundred five thousand, forty-three".