9879985 has 4 divisors (see below), whose sum is σ = 11855988. Its totient is φ = 7903984.

The previous prime is 9879983. The next prime is 9879997. The reversal of 9879985 is 5899789.

9879985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6796449 + 3083536 = 2607^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 9879985 - 2¹ = 9879983 is a prime.

It is a super-2 number, since 2×9879985² = 195228207200450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9879983) 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 3 ways as a sum of consecutive naturals, for example, 987994 + ... + 988003.

It is an arithmetic number, because the mean of its divisors is an integer number (2963997).

Almost surely, 2^9879985 is an apocalyptic number.

It is an amenable number.

9879985 is a deficient number, since it is larger than the sum of its proper divisors (1976003).

9879985 is a wasteful number, since it uses less digits than its factorization.

9879985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976002.

The product of its digits is 1632960, while the sum is 55.

The square root of 9879985 is about 3143.2443430316. The cubic root of 9879985 is about 214.5781162733.

The spelling of 9879985 in words is "nine million, eight hundred seventy-nine thousand, nine hundred eighty-five".