42643 has 2 divisors, whose sum is σ = 42644. Its totient is φ = 42642.
The previous prime is 42641. The next prime is 42649. The reversal of 42643 is 34624.
42643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 42643 - 21 = 42641 is a prime.
Together with 42641, it forms a pair of twin primes.
It is the 207-th Hogben number.
42643 is a lucky number.
It is a plaindrome in base 14.
It is a nialpdrome in base 9.
It is a self number, because there is not a number n which added to its sum of digits gives 42643.
It is not a weakly prime, because it can be changed into another prime (42641) by changing a digit.
It is a nontrivial repunit in base 206.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321 + 21322.
It is an arithmetic number, because the mean of its divisors is an integer number (21322).
242643 is an apocalyptic number.
42643 is a deficient number, since it is larger than the sum of its proper divisors (1).
42643 is an equidigital number, since it uses as much as digits as its factorization.
42643 is an evil number, because the sum of its binary digits is even.
The product of its digits is 576, while the sum is 19.
The square root of 42643 is about 206.5018159726. The cubic root of 42643 is about 34.9367565390.
Subtracting from 42643 its sum of digits (19), we obtain a palindrome (42624).
The spelling of 42643 in words is "forty-two thousand, six hundred forty-three".
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