1340 is nontrivially palindromic in base 15.
It is an Ulam number.
1340 is an undulating number in base 15.
It is a congruent number.
It is an unprimeable number.
21340 is an apocalyptic number.
1340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1340 is a wasteful number, since it uses less digits than its factorization.
1340 is an evil number, because the sum of its binary digits is even.
The square root of 1340 is about 36.6060104354. The cubic root of 1340 is about 11.0247377145.
Adding to 1340 its reverse (431), we get a palindrome (1771).
Subtracting from 1340 its reverse (431), we obtain a palindrome (909).
The spelling of 1340 in words is "one thousand, three hundred forty", and thus it is an iban number.