9904987 has 2 divisors, whose sum is σ = 9904988. Its totient is φ = 9904986.

The previous prime is 9904967. The next prime is 9905003. The reversal of 9904987 is 7894099.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9904987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9904967) 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, 4952493 + 4952494.

It is an arithmetic number, because the mean of its divisors is an integer number (4952494).

Almost surely, 2^9904987 is an apocalyptic number.

9904987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9904987 is an equidigital number, since it uses as much as digits as its factorization.

9904987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 9904987 is about 3147.2189310564. The cubic root of 9904987 is about 214.7589655023.

The spelling of 9904987 in words is "nine million, nine hundred four thousand, nine hundred eighty-seven".