999994987 has 2 divisors, whose sum is σ = 999994988. Its totient is φ = 999994986.

The previous prime is 999994979. The next prime is 999995093. The reversal of 999994987 is 789499999.

It is a weak prime.

It is an emirp because it is prime and its reverse (789499999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999994987 - 2³ = 999994979 is a prime.

It is not a weakly prime, because it can be changed into another prime (999994487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997493 + 499997494.

It is an arithmetic number, because the mean of its divisors is an integer number (499997494).

Almost surely, 2^999994987 is an apocalyptic number.

999994987 is a deficient number, since it is larger than the sum of its proper divisors (1).

999994987 is an equidigital number, since it uses as much as digits as its factorization.

999994987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119042784, while the sum is 73.

The square root of 999994987 is about 31622.6973390949. The cubic root of 999994987 is about 999.9983289972.

The spelling of 999994987 in words is "nine hundred ninety-nine million, nine hundred ninety-four thousand, nine hundred eighty-seven".