9987659 has 4 divisors (see below), whose sum is σ = 10895640. Its totient is φ = 9079680.

The previous prime is 9987643. The next prime is 9987671. The reversal of 9987659 is 9567899.

9987659 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, and also an emirpimes, since its reverse is a distinct semiprime: 9567899 = 11 ⋅869809.

It is a cyclic number.

It is not a de Polignac number, because 9987659 - 2⁴ = 9987643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9987659.

It is not an unprimeable number, because it can be changed into a prime (9986659) 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, 453974 + ... + 453995.

It is an arithmetic number, because the mean of its divisors is an integer number (2723910).

Almost surely, 2^9987659 is an apocalyptic number.

9987659 is a deficient number, since it is larger than the sum of its proper divisors (907981).

9987659 is a wasteful number, since it uses less digits than its factorization.

9987659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907980.

The product of its digits is 1224720, while the sum is 53.

The square root of 9987659 is about 3160.3257743467. The cubic root of 9987659 is about 215.3548062586.

The spelling of 9987659 in words is "nine million, nine hundred eighty-seven thousand, six hundred fifty-nine".