1401, 1402, and 1403 are each the product of two primes (semiprimes) (A056809). 1401, 1403, and 1405 are each the product of two primes (A092125).
1401 is a composite number such that every concatenation of its prime factors (3467 and 4673) is prime (A217263).
1401 is the number of 8-digit primes that can be represented as sums of consecutive squares (A218213).
1401 in base 6 (10253) has five distinct digits (A031983).
Source: On-Line Encyclopedia of Integer Sequences
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