8643993 has 16 divisors (see below), whose sum is σ = 12230400. Its totient is φ = 5415120.

The previous prime is 8643991. The next prime is 8643997. The reversal of 8643993 is 3993468.

8643993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8643993 - 2¹ = 8643991 is a prime.

It is a super-2 number, since 2×8643993² = 149437229968098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8643991) 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, 7378 + ... + 8468.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^8643993 is an apocalyptic number.

It is an amenable number.

8643993 is a deficient number, since it is larger than the sum of its proper divisors (3586407).

8643993 is a wasteful number, since it uses less digits than its factorization.

8643993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252.

The product of its digits is 139968, while the sum is 42.

The square root of 8643993 is about 2940.0668359750. The cubic root of 8643993 is about 205.2287195381.

The spelling of 8643993 in words is "eight million, six hundred forty-three thousand, nine hundred ninety-three".