1236 has 12 divisors (see below), whose sum is σ = 2912. Its totient is φ = 408.

The previous prime is 1231. The next prime is 1237. The reversal of 1236 is 6321.

1236 is nontrivially palindromic in base 16.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 103 = 1236 / (1 + 2 + 3 + 6).

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between odd and even.

It is one of the 548 Lynch-Bell numbers.

1236 is an undulating number in base 16.

1236 is a modest number, since divided by 36 gives 12 as remainder.

It is a plaindrome in base 10.

It is a nialpdrome in base 6, base 12, base 13 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231) by changing a digit.

1236 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 40 + ... + 63.

It is an amenable number.

1236 is an abundant number, since it is smaller than the sum of its proper divisors (1676).

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 (1456).

1236 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 1236 = (1623)₉.

1236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 108 counting only the distinct ones).

The product of its digits is 36, while the sum is 12.

The square root of 1236 is about 35.1567916625. The cubic root of 1236 is about 10.7318062545.

Adding to 1236 its reverse (6321), we get a palindrome (7557).

The spelling of 1236 in words is "one thousand, two hundred thirty-six".