9986665 has 8 divisors (see below), whose sum is σ = 12905928. Its totient is φ = 7374720.

The previous prime is 9986659. The next prime is 9986693. The reversal of 9986665 is 5666899.

It can be written as a sum of positive squares in 4 ways, for example, as 665856 + 9320809 = 816^2 + 3053^2 .

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

It is not a de Polignac number, because 9986665 - 2¹⁵ = 9953897 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76756 + ... + 76885.

It is an arithmetic number, because the mean of its divisors is an integer number (1613241).

Almost surely, 2^9986665 is an apocalyptic number.

It is an amenable number.

9986665 is a deficient number, since it is larger than the sum of its proper divisors (2919263).

9986665 is a wasteful number, since it uses less digits than its factorization.

9986665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153659.

The product of its digits is 699840, while the sum is 49.

The square root of 9986665 is about 3160.1685081653. The cubic root of 9986665 is about 215.3476617823.

The spelling of 9986665 in words is "nine million, nine hundred eighty-six thousand, six hundred sixty-five".