8640917 has 4 divisors (see below), whose sum is σ = 8648556. Its totient is φ = 8633280.

The previous prime is 8640911. The next prime is 8640949. The reversal of 8640917 is 7190468.

8640917 is digitally balanced in base 2, 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 a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6895876 + 1745041 = 2626^2 + 1321^2 .

It is a cyclic number.

It is not a de Polignac number, because 8640917 - 2²⁰ = 7592341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1748 + ... + 4509.

It is an arithmetic number, because the mean of its divisors is an integer number (2162139).

Almost surely, 2^8640917 is an apocalyptic number.

It is an amenable number.

8640917 is a deficient number, since it is larger than the sum of its proper divisors (7639).

8640917 is a wasteful number, since it uses less digits than its factorization.

8640917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7638.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 8640917 is about 2939.5436720688. The cubic root of 8640917 is about 205.2043728256.

The spelling of 8640917 in words is "eight million, six hundred forty thousand, nine hundred seventeen".