1401

1401 = 3 x 467.

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