**1784**= 2

^{3}x 223.

**1784**is a deficient number because the sum of its proper divisors (1 + 2 + 4 + 8 + 223 + 446 + 892 = 1576) is less than the number itself.

**1784**is a year in which the month of February has five Sundays.

**1784**is a number

*n*such that

*n*

^{2}+ 1 and

*n*

^{2}+ 3 are both prime: 3,182,657 and 3,182,659.

**1784**is a composite number such that exactly eight distinct permutations of its digits give primes: 1487, 1847, 4817, 4871, 7481, 7841, 8147, and 8741.

The U.S. Congress ratified the Treaty of Paris on Jan. 14,

**1784**, officially ending the Revolutionary War.

Source: The Positive Integers