11812 has 6 divisors (see below), whose sum is σ = 20678. Its totient is φ = 5904.

The previous prime is 11807. The next prime is 11813. The reversal of 11812 is 21811.

It can be written as a sum of positive squares in only one way, i.e., 11236 + 576 = 106^2 + 24^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11792 and 11801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473 + ... + 1480.

2¹¹⁸¹² is an apocalyptic number.

It is an amenable number.

11812 is a deficient number, since it is larger than the sum of its proper divisors (8866).

11812 is a wasteful number, since it uses less digits than its factorization.

11812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957 (or 2955 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 11812 is about 108.6830253535. The cubic root of 11812 is about 22.7740959524.

Subtracting 11812 from its reverse (21811), we obtain a palindrome (9999).

The spelling of 11812 in words is "eleven thousand, eight hundred twelve".