9799987 has 2 divisors, whose sum is σ = 9799988. Its totient is φ = 9799986.

The previous prime is 9799969. The next prime is 9799997. The reversal of 9799987 is 7899979.

It is a strong prime.

It is an emirp because it is prime and its reverse (7899979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9799987 is a prime.

It is a super-3 number, since 3×9799987³ (a number of 22 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (9799927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4899993 + 4899994.

It is an arithmetic number, because the mean of its divisors is an integer number (4899994).

Almost surely, 2^9799987 is an apocalyptic number.

9799987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9799987 is an equidigital number, since it uses as much as digits as its factorization.

9799987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 58.

The square root of 9799987 is about 3130.4930921502. The cubic root of 9799987 is about 213.9974014882.

The spelling of 9799987 in words is "nine million, seven hundred ninety-nine thousand, nine hundred eighty-seven".