9806 has 4 divisors (see below), whose sum is σ = 14712. Its totient is φ = 4902.

The previous prime is 9803. The next prime is 9811. The reversal of 9806 is 6089.

9806 = 48² + 49² + ... + 51².

9806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2450 + ... + 2453.

It is an arithmetic number, because the mean of its divisors is an integer number (3678).

2⁹⁸⁰⁶ is an apocalyptic number.

9806 is a deficient number, since it is larger than the sum of its proper divisors (4906).

9806 is a wasteful number, since it uses less digits than its factorization.

9806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 9806 is about 99.0252493054. The cubic root of 9806 is about 21.4041160162.

The spelling of 9806 in words is "nine thousand, eight hundred six".