9990685 has 8 divisors (see below), whose sum is σ = 12010680. Its totient is φ = 7977984.

The previous prime is 9990683. The next prime is 9990689. The reversal of 9990685 is 5860999.

It is a happy number.

9990685 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 143641 + 9847044 = 379^2 + 3138^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9990685 - 2¹ = 9990683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990683) 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 7 ways as a sum of consecutive naturals, for example, 1881 + ... + 4849.

It is an arithmetic number, because the mean of its divisors is an integer number (1501335).

Almost surely, 2^9990685 is an apocalyptic number.

It is an amenable number.

9990685 is a deficient number, since it is larger than the sum of its proper divisors (2019995).

9990685 is a wasteful number, since it uses less digits than its factorization.

9990685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 9990685 is about 3160.8044862028. The cubic root of 9990685 is about 215.3765530243.

It can be divided in two parts, 9990 and 685, that multiplied together give a triangular number (6843150 = T₃₆₉₉).

The spelling of 9990685 in words is "nine million, nine hundred ninety thousand, six hundred eighty-five".