The symbolism and occurrences of the number nineteen and the nineteenth letter of the Hebrew alphabet carry great importance in the Bible.  The NIV uses the number nineteen six times (number of man).  The nineteenth letter in the Hebrew alphabet is KOPH, which corresponds to the letter Q.  Joshua 19 and 1 Chronicles 24, 25 are parts of list for towns, priest and singers. 2 Samuel 2:30 states the number of David’s men that are killed in the cycle of battles with Abner’s forces after the death of King Saul. 2 Kings 25:8 and Jeremiah 52: 12 tell the same story – that of Jerusalem being burned in the nineteenth year of Nebuchadnezzar.

KOPH, the letter, and the occurrences of number nineteen are intertwined.  KOPH is associated with cycles, especially the cycles of the Feast.  In Joshua 19:38 the towns that are listed make up the territory of Naphtali, which is Galilee.  2 Samuel is the first of several years’ worth of fighting in Israel.

The story of Jerusalem being sacked/burned is part of a cycle in the history of that city.  David starts it when he captures it for his capital. Egyptians plundering it, the Northern Tribes breaking down its walls are also part of the cycle.  It continued with the Romans when they tore the city apart. 

For more study on the number see the website below.  

https://www.christianforums.com/threads/the-hebrew-letter-qoph-koph-the-back-of-the-head.61826/