9990887 has 2 divisors, whose sum is σ = 9990888. Its totient is φ = 9990886.

The previous prime is 9990863. The next prime is 9990899. The reversal of 9990887 is 7880999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9990887 - 2¹² = 9986791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990817) 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, 4995443 + 4995444.

It is an arithmetic number, because the mean of its divisors is an integer number (4995444).

Almost surely, 2^9990887 is an apocalyptic number.

9990887 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990887 is an equidigital number, since it uses as much as digits as its factorization.

9990887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9990887 is about 3160.8364399317. The cubic root of 9990887 is about 215.3780045688.

The spelling of 9990887 in words is "nine million, nine hundred ninety thousand, eight hundred eighty-seven".