9990899 has 2 divisors, whose sum is σ = 9990900. Its totient is φ = 9990898.

The previous prime is 9990887. The next prime is 9990913. The reversal of 9990899 is 9980999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990899 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9990899.

It is not a weakly prime, because it can be changed into another prime (9990859) 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, 4995449 + 4995450.

It is an arithmetic number, because the mean of its divisors is an integer number (4995450).

Almost surely, 2^9990899 is an apocalyptic number.

9990899 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990899 is an equidigital number, since it uses as much as digits as its factorization.

9990899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9990899 is about 3160.8383381628. The cubic root of 9990899 is about 215.3780907986.

The spelling of 9990899 in words is "nine million, nine hundred ninety thousand, eight hundred ninety-nine".