9990797 has 2 divisors, whose sum is σ = 9990798. Its totient is φ = 9990796.

The previous prime is 9990779. The next prime is 9990803. The reversal of 9990797 is 7970999.

9990797 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (9990779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5470921 + 4519876 = 2339^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990797 - 2⁶ = 9990733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990727) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995398 + 4995399.

It is an arithmetic number, because the mean of its divisors is an integer number (4995399).

Almost surely, 2^9990797 is an apocalyptic number.

It is an amenable number.

9990797 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990797 is an equidigital number, since it uses as much as digits as its factorization.

9990797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 9990797 is about 3160.8222031617. The cubic root of 9990797 is about 215.3773578435.

The spelling of 9990797 in words is "nine million, nine hundred ninety thousand, seven hundred ninety-seven".