diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # fast-arithmetic
 
+## 0.6.2.1
+
+  * Export `radical`
+
 ## 0.6.2.0
 
   * Add `radical` for computing radicals of integers
diff --git a/fast-arithmetic.cabal b/fast-arithmetic.cabal
--- a/fast-arithmetic.cabal
+++ b/fast-arithmetic.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.18
 name: fast-arithmetic
-version: 0.6.2.0
+version: 0.6.2.2
 license: BSD3
 license-file: LICENSE
 copyright: Copyright: (c) 2018 Vanessa McHale
@@ -64,32 +64,32 @@
     build-depends:
         base >=4.3 && <5,
         composition-prelude >=1.2.0.0
-    
+
     if impl(ghc >=8.0)
         cc-options: -mtune=native -flto -O3
-    
+
     if os(windows)
         buildable: False
-    
+
     if !flag(no-integer-gmp)
         exposed-modules:
             Numeric.Combinatorics
-    
+
     if !flag(no-integer-gmp)
         c-sources:
             cbits/combinatorics.c
-    
+
     if !flag(no-integer-gmp)
         build-depends:
             gmpint -any
-    
+
     if os(windows)
         buildable: False
-    
+
     if impl(ghc >=8.0)
         ghc-options: -Wincomplete-uni-patterns -Wincomplete-record-updates
                      -Wcompat
-    
+
     if flag(development)
         ghc-options: -Werror
 
@@ -105,17 +105,17 @@
         hspec -any,
         QuickCheck -any,
         arithmoi >=0.6.0.0
-    
+
     if impl(ghc >=8.4)
         build-depends:
             combinat-compat -any
     else
         build-depends:
             combinat -any
-    
+
     if flag(development)
         ghc-options: -Werror
-    
+
     if impl(ghc >=8.0)
         ghc-options: -Wincomplete-uni-patterns -Wincomplete-record-updates
                      -Wcompat
@@ -131,17 +131,17 @@
         fast-arithmetic -any,
         criterion -any,
         arithmoi >=0.6.0.0
-    
+
     if impl(ghc >=8.4)
         build-depends:
             combinat-compat -any
     else
         build-depends:
             combinat -any
-    
+
     if flag(development)
         ghc-options: -Werror
-    
+
     if impl(ghc >=8.0)
         ghc-options: -Wincomplete-uni-patterns -Wincomplete-record-updates
                      -Wcompat
diff --git a/src/Numeric/NumberTheory.hs b/src/Numeric/NumberTheory.hs
--- a/src/Numeric/NumberTheory.hs
+++ b/src/Numeric/NumberTheory.hs
@@ -11,6 +11,7 @@
                             , isPerfect
                             , sumDivisors
                             , isPrime
+                            , radical
                             ) where
 
 import           Foreign.C