This is the 13364th most frequent Russian word.
набравший
"Набравший" means "having gained" or "having gathered."
The word 'набравший' is from 'набрать', meaning 'to gain, to gather'. In this sentence, it functions as a past active participle modifying 'город', indicating that the city has gained popularity.
Город набравший популярность среди туристов, славится своими достопримечательностями.
The city that has gained popularity among tourists is famous for its landmarks.
Here, 'набравшим' is a past active participle used substantively, referring to a person who drew water ('он'). It describes the action performed by the person in the past.
Он был первым набравшим воду из колодца после урагана.
He was the first to have drawn water from the well after the hurricane.
The participle 'набравший' describes the journalist ('журналист'), indicating that he gained or collected important information before proceeding to the meeting.