9879997 has 2 divisors, whose sum is σ = 9879998. Its totient is φ = 9879996.

The previous prime is 9879983. The next prime is 9880001. The reversal of 9879997 is 7999789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6661561 + 3218436 = 2581^2 + 1794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9879997 is a prime.

It is a super-2 number, since 2×9879997² = 195228681440018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9879937) 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, 4939998 + 4939999.

It is an arithmetic number, because the mean of its divisors is an integer number (4939999).

Almost surely, 2^9879997 is an apocalyptic number.

It is an amenable number.

9879997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9879997 is an equidigital number, since it uses as much as digits as its factorization.

9879997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 58.

The square root of 9879997 is about 3143.2462518867. The cubic root of 9879997 is about 214.5782031471.

The spelling of 9879997 in words is "nine million, eight hundred seventy-nine thousand, nine hundred ninety-seven".