9640891 has 8 divisors (see below), whose sum is σ = 10525760. Its totient is φ = 8776512.

The previous prime is 9640889. The next prime is 9640913. The reversal of 9640891 is 1980469.

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 9640891 - 2¹ = 9640889 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 9640891.

It is not an unprimeable number, because it can be changed into a prime (9640811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4131 + ... + 6028.

It is an arithmetic number, because the mean of its divisors is an integer number (1315720).

Almost surely, 2^9640891 is an apocalyptic number.

9640891 is a deficient number, since it is larger than the sum of its proper divisors (884869).

9640891 is a wasteful number, since it uses less digits than its factorization.

9640891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10245.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 9640891 is about 3104.9784218252. The cubic root of 9640891 is about 212.8330445391.

The spelling of 9640891 in words is "nine million, six hundred forty thousand, eight hundred ninety-one".