9988685 has 16 divisors (see below), whose sum is σ = 14019456. Its totient is φ = 6689088.

The previous prime is 9988633. The next prime is 9988687. The reversal of 9988685 is 5868899.

9988685 = 105² + 106² + ... + 314².

It is not a de Polignac number, because 9988685 - 2¹² = 9984589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988687) 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 in 15 ways as a sum of consecutive naturals, for example, 1814 + ... + 4823.

It is an arithmetic number, because the mean of its divisors is an integer number (876216).

Almost surely, 2^9988685 is an apocalyptic number.

It is an amenable number.

9988685 is a deficient number, since it is larger than the sum of its proper divisors (4030771).

9988685 is a wasteful number, since it uses less digits than its factorization.

9988685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6692.

The product of its digits is 1244160, while the sum is 53.

The square root of 9988685 is about 3160.4880952157. The cubic root of 9988685 is about 215.3621802410.

The spelling of 9988685 in words is "nine million, nine hundred eighty-eight thousand, six hundred eighty-five".