DB2 SQL to Oracle SQL change

Can someone please confirm syntax db2 vs oracle just want to make sure it's correct

I don't know db2 syntax that well (or not much at all) additionally, I don't have ability to check db2 syntax.

DB2 syntax:

SELECT DECIMAL(123245632134.1234567 ,15, 3) FROM TABLE;

retuns  (I think)

123245632134.123 <-- NUMBER

Oracle syntax:

SELECT TO_NUMBER(TO_CHAR(123245632134.1234567,'999999999999.999')) FROM TABLE;

returns

 123245632134.123 <-- NUMBER

Oracle syntax return number correctly however for me this looks weird, is there any other shorter way to present DB2 decimal function Decimal(num,15, 3) in Oracle SQL??

Thanks

Sobek77