9871943 has 2 divisors, whose sum is σ = 9871944. Its totient is φ = 9871942.

The previous prime is 9871931. The next prime is 9871949. The reversal of 9871943 is 3491789.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9871943 - 2¹⁸ = 9609799 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9871943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9871949) 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, 4935971 + 4935972.

It is an arithmetic number, because the mean of its divisors is an integer number (4935972).

Almost surely, 2^9871943 is an apocalyptic number.

9871943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9871943 is an equidigital number, since it uses as much as digits as its factorization.

9871943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 9871943 is about 3141.9648311208. The cubic root of 9871943 is about 214.5198805024.

It can be divided in two parts, 9 and 871943, that multiplied together give a palindrome (7847487).

The spelling of 9871943 in words is "nine million, eight hundred seventy-one thousand, nine hundred forty-three".