897

897 = 3 x 13 x 23. It is the only sphenic number with prime factors of the form p(p + 10)(p + 20).

897 is divisible by the sum of its prime factors (A046346).

897 is a Cullen number; it has the form n x 2ⁿ + 1, for n = 7 (A002064).

897 is the sum of the first 34 nonprimes (A051349).

The sum of the digits of 897 is equal to 8 times the number of digits (A061425).

897 is the sum of three nonzero fourth powers (A003337).

897 divides 47⁴ - 1.

Source: Prime Curios!

385

385 = 5 x 7 x 11.

385 is the number of integer partitions of 18.

385 is a square pyramidal number (the sum of the squares of all integers from 1 to 10).

385 is a Cullen number.

385 = 193² - 192².

385 is 1441 in base 6 and 181 in base 18.

Source: What's Special About This Number?