8140643 has 16 divisors (see below), whose sum is σ = 9884160. Its totient is φ = 6553536.

The previous prime is 8140609. The next prime is 8140651. The reversal of 8140643 is 3460418.

It is a cyclic number.

It is not a de Polignac number, because 8140643 - 2¹⁶ = 8075107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8140663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9071 + ... + 9927.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^8140643 is an apocalyptic number.

8140643 is a deficient number, since it is larger than the sum of its proper divisors (1743517).

8140643 is a wasteful number, since it uses less digits than its factorization.

8140643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 8140643 is about 2853.1812070039. The cubic root of 8140643 is about 201.1652230918.

The spelling of 8140643 in words is "eight million, one hundred forty thousand, six hundred forty-three".