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1340 = 22567

1340 has 12 divisors (see below), whose sum is σ = 2856. Its totient is φ = 528.

The previous prime is 1327. The next prime is 1361. The reversal of 1340 is 431.

1340 is nontrivially palindromic in base 15.

It is an Ulam number.

It is a lonely number, since its distance to closest prime (1327) sets a new record.

1340 is an undulating number in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14 + ... + 53.

It is an arithmetic number, because the mean of its divisors is an integer number (238).

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.

1340 is an abundant number, since it is smaller than the sum of its proper divisors (1516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428).

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 sum of its prime factors is 76 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

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.

Divisors: 1 2 4 5 10 20 67 134 268 335 670 1340