9984987 has 12 divisors (see below), whose sum is σ = 14758744. Its totient is φ = 6501600.

The previous prime is 9984979. The next prime is 9984991. The reversal of 9984987 is 7894899.

It is not a de Polignac number, because 9984987 - 2³ = 9984979 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9984187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12514 + ... + 13287.

Almost surely, 2^9984987 is an apocalyptic number.

9984987 is a deficient number, since it is larger than the sum of its proper divisors (4773757).

9984987 is a wasteful number, since it uses less digits than its factorization.

9984987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25850 (or 25847 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 9984987 is about 3159.9030048405. The cubic root of 9984987 is about 215.3355999105.

The spelling of 9984987 in words is "nine million, nine hundred eighty-four thousand, nine hundred eighty-seven".