1366 has 4 divisors (see below), whose sum is σ = 2052. Its totient is φ = 682.

The previous prime is 1361. The next prime is 1367. The reversal of 1366 is 6631.

It is a happy number.

1366 is nontrivially palindromic in base 3.

1366 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

1366 is an esthetic number in base 3, because in such base 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: 6631 = 19 ⋅349.

1366 is an undulating number in base 3.

1366 is strictly pandigital in base 5.

It is a plaindrome in base 4, base 9, base 10 and base 16.

It is a nialpdrome in base 13 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340 + ... + 343.

It is an arithmetic number, because the mean of its divisors is an integer number (513).

1366 is a deficient number, since it is larger than the sum of its proper divisors (686).

1366 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 7 representation: 1366 = (3661)₇.

1366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685.

The product of its digits is 108, while the sum is 16.

The square root of 1366 is about 36.9594372252. The cubic root of 1366 is about 11.0955857241.

Adding to 1366 its reverse (6631), we get a palindrome (7997).

It can be divided in two parts, 13 and 66, that multiplied together give a palindrome (858).

The spelling of 1366 in words is "one thousand, three hundred sixty-six".