9979843 has 2 divisors, whose sum is σ = 9979844. Its totient is φ = 9979842.

The previous prime is 9979819. The next prime is 9979859. The reversal of 9979843 is 3489799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9979843 - 2⁵ = 9979811 is a prime.

It is an Ulam number.

9979843 is a lucky number.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989921 + 4989922.

It is an arithmetic number, because the mean of its divisors is an integer number (4989922).

Almost surely, 2^9979843 is an apocalyptic number.

9979843 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979843 is an equidigital number, since it uses as much as digits as its factorization.

9979843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 9979843 is about 3159.0889509477. The cubic root of 9979843 is about 215.2986151654.

The spelling of 9979843 in words is "nine million, nine hundred seventy-nine thousand, eight hundred forty-three".