8640043 has 4 divisors (see below), whose sum is σ = 8659168. Its totient is φ = 8620920.

The previous prime is 8640017. The next prime is 8640059. The reversal of 8640043 is 3400468.

8640043 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.

It is a cyclic number.

It is not a de Polignac number, because 8640043 - 2⁹ = 8639531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8640013) 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, 8868 + ... + 9793.

It is an arithmetic number, because the mean of its divisors is an integer number (2164792).

Almost surely, 2^8640043 is an apocalyptic number.

8640043 is a deficient number, since it is larger than the sum of its proper divisors (19125).

8640043 is a wasteful number, since it uses less digits than its factorization.

8640043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19124.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 8640043 is about 2939.3950057793. The cubic root of 8640043 is about 205.1974540125.

The spelling of 8640043 in words is "eight million, six hundred forty thousand, forty-three".