9939985 has 16 divisors (see below), whose sum is σ = 13779072. Its totient is φ = 6803200.

The previous prime is 9939971. The next prime is 9940001. The reversal of 9939985 is 5899399.

It is not a de Polignac number, because 9939985 - 2⁷ = 9939857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 4381 + ... + 6250.

It is an arithmetic number, because the mean of its divisors is an integer number (861192).

Almost surely, 2^9939985 is an apocalyptic number.

It is an amenable number.

9939985 is a deficient number, since it is larger than the sum of its proper divisors (3839087).

9939985 is a wasteful number, since it uses less digits than its factorization.

9939985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10664.

The product of its digits is 787320, while the sum is 52.

The square root of 9939985 is about 3152.7741752304. The cubic root of 9939985 is about 215.0116092523.

The spelling of 9939985 in words is "nine million, nine hundred thirty-nine thousand, nine hundred eighty-five".