1347 has 4 divisors (see below), whose sum is σ = 1800. Its totient is φ = 896.

The previous prime is 1327. The next prime is 1361. The reversal of 1347 is 7431.

Added to its reverse (7431) it gives a triangular number (8778 = T₁₃₂).

1347 is an esthetic number in base 6 and base 16, because in such bases its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7431 = 3 ⋅2477.

It is a cyclic number.

It is not a de Polignac number, because 1347 - 2⁶ = 1283 is a prime.

It is a D-number.

It is a plaindrome in base 10.

It is a nialpdrome in base 12 and base 16.

It is not an unprimeable number, because it can be changed into a prime (1307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222 + ... + 227.

It is an arithmetic number, because the mean of its divisors is an integer number (450).

2¹³⁴⁷ is an apocalyptic number.

1347 is a deficient number, since it is larger than the sum of its proper divisors (453).

1347 is an equidigital number, since it uses as much as digits as its factorization.

1347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 84, while the sum is 15.

The square root of 1347 is about 36.7014986070. The cubic root of 1347 is about 11.0439016875.

Adding to 1347 its product of digits (84), we get a triangular number (1431 = T₅₃).

Adding to 1347 its reverse (7431), we get a palindrome (8778).

Subtracting 1347 from its reverse (7431), we obtain a square (6084 = 78²).

It can be divided in two parts, 134 and 7, that added together give a palindrome (141).

The spelling of 1347 in words is "one thousand, three hundred forty-seven", and thus it is an iban number.