2520
Smallest natural number that is divisible by all integers from 1 to 10 (= their least common multiple).
Superior highly composite number - it has 48 divisors:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 21, 24, 28, 30, 35, 36, 40, 42, 45, 56, 60, 63, 70, 72, 84, 90,
105, 120, 126, 140, 168, 180, 210, 252, 280, 315, 360, 420, 504, 630, 840, 1260, 2520
Biggest highly composite number which is half of the next highly composite number (7!).
Last highly composite number that is a divisor of all following highly composite numbers.
more interesting 4-digit numbers:
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