9987641 has 16 divisors (see below), whose sum is σ = 10741248. Its totient is φ = 9273600.

The previous prime is 9987617. The next prime is 9987643. The reversal of 9987641 is 1467899.

9987641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9987641 - 2⁶ = 9987577 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9987592 and 9987601.

It is not an unprimeable number, because it can be changed into a prime (9987643) 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 15 ways as a sum of consecutive naturals, for example, 136781 + ... + 136853.

It is an arithmetic number, because the mean of its divisors is an integer number (671328).

Almost surely, 2^9987641 is an apocalyptic number.

It is an amenable number.

9987641 is a deficient number, since it is larger than the sum of its proper divisors (753607).

9987641 is a wasteful number, since it uses less digits than its factorization.

9987641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232.

The product of its digits is 108864, while the sum is 44.

The square root of 9987641 is about 3160.3229265377. The cubic root of 9987641 is about 215.3546768860.

The spelling of 9987641 in words is "nine million, nine hundred eighty-seven thousand, six hundred forty-one".