9979643 has 2 divisors, whose sum is σ = 9979644. Its totient is φ = 9979642.

The previous prime is 9979639. The next prime is 9979681. The reversal of 9979643 is 3469799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9979643 - 2² = 9979639 is a prime.

It is a d-powerful number, because it can be written as 9 + 9² + 7⁸ + 9³ + 6² + 4¹¹ + 3⁹ .

It is not a weakly prime, because it can be changed into another prime (9979243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989821 + 4989822.

It is an arithmetic number, because the mean of its divisors is an integer number (4989822).

Almost surely, 2^9979643 is an apocalyptic number.

9979643 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979643 is an equidigital number, since it uses as much as digits as its factorization.

9979643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 47.

The square root of 9979643 is about 3159.0572960933. The cubic root of 9979643 is about 215.2971769327.

The spelling of 9979643 in words is "nine million, nine hundred seventy-nine thousand, six hundred forty-three".