9989884787 has 2 divisors, whose sum is σ = 9989884788. Its totient is φ = 9989884786.

The previous prime is 9989884769. The next prime is 9989884789. The reversal of 9989884787 is 7874889899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9989884787 - 2³² = 5694917491 is a prime.

Together with 9989884789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9989884789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994942393 + 4994942394.

It is an arithmetic number, because the mean of its divisors is an integer number (4994942394).

Almost surely, 2^9989884787 is an apocalyptic number.

9989884787 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989884787 is an equidigital number, since it uses as much as digits as its factorization.

9989884787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 585252864, while the sum is 77.

The square root of 9989884787 is about 99949.4111388356. The cubic root of 9989884787 is about 2153.7080261053.

The spelling of 9989884787 in words is "nine billion, nine hundred eighty-nine million, eight hundred eighty-four thousand, seven hundred eighty-seven".