11644 has 12 divisors (see below), whose sum is σ = 21168. Its totient is φ = 5600.

The previous prime is 11633. The next prime is 11657. The reversal of 11644 is 44611.

It is a happy number.

11644 is nontrivially palindromic in base 3.

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, 129 + ... + 199.

It is an arithmetic number, because the mean of its divisors is an integer number (1764).

2¹¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

11644 is a deficient number, since it is larger than the sum of its proper divisors (9524).

11644 is a wasteful number, since it uses less digits than its factorization.

11644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 114 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 11644 is about 107.9073676817. The cubic root of 11644 is about 22.6656093317.

Subtracting from 11644 its sum of digits (16), we obtain a triangular number (11628 = T₁₅₂).

It can be divided in two parts, 1164 and 4, that multiplied together give a triangular number (4656 = T₉₆).

The spelling of 11644 in words is "eleven thousand, six hundred forty-four".