9640987 has 4 divisors (see below), whose sum is σ = 9865240. Its totient is φ = 9416736.

The previous prime is 9640973. The next prime is 9640991. The reversal of 9640987 is 7890469.

9640987 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: 7890469 = 2663 ⋅2963.

It is a cyclic number.

It is not a de Polignac number, because 9640987 - 2¹⁵ = 9608219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 224209 = 9640987 / (9 + 6 + 4 + 0 + 9 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9640957) 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, 112062 + ... + 112147.

It is an arithmetic number, because the mean of its divisors is an integer number (2466310).

Almost surely, 2^9640987 is an apocalyptic number.

9640987 is a deficient number, since it is larger than the sum of its proper divisors (224253).

9640987 is a wasteful number, since it uses less digits than its factorization.

9640987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224252.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 9640987 is about 3104.9938808313. The cubic root of 9640987 is about 212.8337509712.

The spelling of 9640987 in words is "nine million, six hundred forty thousand, nine hundred eighty-seven".