9999943 has 2 divisors, whose sum is σ = 9999944. Its totient is φ = 9999942.

The previous prime is 9999937. The next prime is 9999971. The reversal of 9999943 is 3499999.

It is a weak prime.

It is an emirp because it is prime and its reverse (3499999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999943 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999971 + 4999972.

It is an arithmetic number, because the mean of its divisors is an integer number (4999972).

Almost surely, 2^9999943 is an apocalyptic number.

9999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999943 is an equidigital number, since it uses as much as digits as its factorization.

9999943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 52.

The square root of 9999943 is about 3162.2686476642. The cubic root of 9999943 is about 215.4430596598.

The spelling of 9999943 in words is "nine million, nine hundred ninety-nine thousand, nine hundred forty-three".