Kodansha Kanji Dictionary (Jack Halpern, 2013):
2400
Morohashi Daikanwajiten (Volume 2, page 0358):
2245
New Japanese-English Character Dictionary (Jack Halpern, 1990):
1906
The Modern Reader's Japanese-English Character Dictionary (Andrew Nelson):
556
The New Nelson Japanese-English Character Dictionary (John Haig):
518