diff --git a/src/app/components/inputnumber/inputnumber.spec.ts b/src/app/components/inputnumber/inputnumber.spec.ts
index f0e105eebe4..76776fbff01 100755
--- a/src/app/components/inputnumber/inputnumber.spec.ts
+++ b/src/app/components/inputnumber/inputnumber.spec.ts
@@ -70,5 +70,35 @@ describe('InputNumber', () => {
             inputNumber.onInputKeyPress(pressFiveEvent);
             expect(testComponent.val).toEqual(5.5);
         });
+        it('should model value', () => {
+            inputNumber.onInputKeyPress(pressFiveEvent);
+            inputNumber.onInputKeyPress(pressNumpadDecimalWithDotEvent);
+            inputNumber.onInputKeyPress(pressFiveEvent);
+            expect(typeof inputNumber.value).toEqual('number');
+            expect(inputNumber.value).toEqual(5.5);
+            inputNumber.onInputBlur({} as Event);
+            expect(typeof inputNumber.value).toEqual('number');
+            expect(inputNumber.value).toEqual(5.5);
+            const inputMaskEl = fixture.debugElement.query(By.css('input'));
+            inputMaskEl.nativeElement.value = '';
+            const pressMinusEvent = new KeyboardEvent('event', {
+                code: 'Minus',
+                key: '-',
+                keyCode: '-'.charCodeAt(0)
+            });
+            inputNumber.onInputKeyPress(pressMinusEvent);
+            //@ts-ignore primeNG can can set value to string '-'
+            expect(inputNumber.value).toEqual('-');
+            expect(typeof inputNumber.value).toEqual('string');
+            inputNumber.onInputBlur({} as Event);
+            expect(inputNumber.value).toEqual(null);
+            inputNumber.onInputKeyPress(pressMinusEvent);
+            inputNumber.onInputKeyPress(pressFiveEvent);
+            expect(typeof inputNumber.value).toEqual('number');
+            expect(inputNumber.value).toEqual(-5);
+            inputNumber.onInputBlur({} as Event);
+            expect(typeof inputNumber.value).toEqual('number');
+            expect(inputNumber.value).toEqual(-5);
+        });
     });
 });
diff --git a/src/app/components/inputnumber/inputnumber.ts b/src/app/components/inputnumber/inputnumber.ts
index 4b1ccb338d9..090d5f1d686 100644
--- a/src/app/components/inputnumber/inputnumber.ts
+++ b/src/app/components/inputnumber/inputnumber.ts
@@ -1379,10 +1379,11 @@ export class InputNumber implements OnInit, AfterContentInit, OnChanges, Control
     onInputBlur(event: Event) {
         this.focused = false;
 
-        let newValue = this.validateValue(this.parseValue(this.input.nativeElement.value)).toString();
-        this.input.nativeElement.value = this.formatValue(newValue);
-        this.input.nativeElement.setAttribute('aria-valuenow', newValue);
-        this.updateModel(event, newValue);
+        const newValueNumber = this.validateValue(this.parseValue(this.input.nativeElement.value));
+        const newValueString = newValueNumber?.toString();
+        this.input.nativeElement.value = this.formatValue(newValueString);
+        this.input.nativeElement.setAttribute('aria-valuenow', newValueString);
+        this.updateModel(event, newValueNumber);
         this.onBlur.emit(event);
     }