1425 = 3 x 5 x 5 x 19.
1425 is 10110010001 in base 2 (binary). It is a self-descriptive number in base 5: 21200.
The sum of the digits of 1425 is equal to the number of divisors of 1425 (1, 3, 5, 15, 19, 25, 57, 75, 95, 285, 475, 1425): 1 + 4 + 2 + 5 = 12 (A057531 and A057532).
1425 is the sum of the first 31 semiprimes (A062198).
Every digit occurs at least once in 14254: 4,123,437,890,625 (A121321).
Source: On-Line Encyclopedia of Integer Sequences
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