1636 has 6 divisors (see below), whose sum is σ = 2870.
Its totient is φ = 816.
The previous prime is 1627. The next prime is 1637. The reversal of 1636 is 6361.
It is a happy number.
1636 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It can be written as a sum of positive squares in only one way, i.e., 1600 + 36 = 40^2 + 6^2
It is an alternating number because its digits alternate between odd and even.
1636 is a modest number, since divided by 36 gives 16 as remainder.
It is a plaindrome in base 11.
It is a nialpdrome in base 12, base 15 and base 16.
It is not an unprimeable number, because it can be changed into a prime (1637) 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 as a sum of consecutive naturals, namely, 201 + ... + 208.
21636 is an apocalyptic number.
It is an amenable number.
1636 is a deficient number, since it is larger than the sum of its proper divisors (1234).
1636 is a wasteful number, since it uses less digits than its factorization.
1636 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 413 (or 411 counting only the distinct ones).
The product of its digits is 108, while the sum is 16.
The square root of 1636 is about 40.4474968323.
The cubic root of 1636 is about 11.7831416835.
Adding to 1636 its reverse (6361), we get a palindrome (7997).
It can be divided in two parts, 163 and 6, that added together give a square (169 = 132).
The spelling of 1636 in words is "one thousand, six hundred thirty-six".