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18443 is a prime number
BaseRepresentation
bin100100000001011
3221022002
410200023
51042233
6221215
7104525
oct44013
927262
1018443
1112947
12a80b
138519
146a15
1556e8
hex480b

18443 has 2 divisors, whose sum is σ = 18444. Its totient is φ = 18442.

The previous prime is 18439. The next prime is 18451. The reversal of 18443 is 34481.

It is a weak prime.

18443 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 18443 - 22 = 18439 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221 + 9222.

It is an arithmetic number, because the mean of its divisors is an integer number (9222).

218443 is an apocalyptic number.

18443 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443 is an equidigital number, since it uses as much as digits as its factorization.

18443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 18443 is about 135.8050072715. The cubic root of 18443 is about 26.4206717494.

The spelling of 18443 in words is "eighteen thousand, four hundred forty-three".