9888665 has 8 divisors (see below), whose sum is σ = 11989320. Its totient is φ = 7828992.

The previous prime is 9888661. The next prime is 9888719. The reversal of 9888665 is 5668889.

9888665 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 3003289 + 6885376 = 1733^2 + 2624^2 .

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 9888665 - 2² = 9888661 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9888661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9710 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (1498665).

Almost surely, 2^9888665 is an apocalyptic number.

It is an amenable number.

9888665 is a deficient number, since it is larger than the sum of its proper divisors (2100655).

9888665 is a wasteful number, since it uses less digits than its factorization.

9888665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20491.

The product of its digits is 829440, while the sum is 50.

The square root of 9888665 is about 3144.6247788886. The cubic root of 9888665 is about 214.6409366411.

The spelling of 9888665 in words is "nine million, eight hundred eighty-eight thousand, six hundred sixty-five".