9812 has 12 divisors (see below), whose sum is σ = 18816. Its totient is φ = 4440.

The previous prime is 9811. The next prime is 9817. The reversal of 9812 is 2189.

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

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 155.

It is an arithmetic number, because the mean of its divisors is an integer number (1568).

2⁹⁸¹² is an apocalyptic number.

It is an amenable number.

9812 is a deficient number, since it is larger than the sum of its proper divisors (9004).

9812 is a wasteful number, since it uses less digits than its factorization.

9812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 236 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 9812 is about 99.0555399763. The cubic root of 9812 is about 21.4084806403.

It can be divided in two parts, 98 and 12, that multiplied together give a triangular number (1176 = T₄₈).

The spelling of 9812 in words is "nine thousand, eight hundred twelve".