9986920787 has 2 divisors, whose sum is σ = 9986920788. Its totient is φ = 9986920786.

The previous prime is 9986920763. The next prime is 9986920813. The reversal of 9986920787 is 7870296899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9986920787 - 2¹² = 9986916691 is a prime.

It is not a weakly prime, because it can be changed into another prime (9986920747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993460393 + 4993460394.

It is an arithmetic number, because the mean of its divisors is an integer number (4993460394).

Almost surely, 2^9986920787 is an apocalyptic number.

9986920787 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986920787 is an equidigital number, since it uses as much as digits as its factorization.

9986920787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 65.

The square root of 9986920787 is about 99934.5825377782. The cubic root of 9986920787 is about 2153.4950032271.

The spelling of 9986920787 in words is "nine billion, nine hundred eighty-six million, nine hundred twenty thousand, seven hundred eighty-seven".