1008643 has 4 divisors (see below), whose sum is σ = 1027728. Its totient is φ = 989560.

The previous prime is 1008617. The next prime is 1008659. The reversal of 1008643 is 3468001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3468001 = 31 ⋅111871.

It is a cyclic number.

It is not a de Polignac number, because 1008643 - 2⁵ = 1008611 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1008613) 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, 9463 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (256932).

2^1008643 is an apocalyptic number.

1008643 is a deficient number, since it is larger than the sum of its proper divisors (19085).

1008643 is an equidigital number, since it uses as much as digits as its factorization.

1008643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19084.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1008643 is about 1004.3122024550. The cubic root of 1008643 is about 100.2872739465.

The spelling of 1008643 in words is "one million, eight thousand, six hundred forty-three".