9816645 has 16 divisors (see below), whose sum is σ = 16248960. Its totient is φ = 5054784.

The previous prime is 9816641. The next prime is 9816647. The reversal of 9816645 is 5466189.

It is not a de Polignac number, because 9816645 - 2² = 9816641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9816641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10849 + ... + 11718.

It is an arithmetic number, because the mean of its divisors is an integer number (1015560).

Almost surely, 2^9816645 is an apocalyptic number.

It is an amenable number.

9816645 is a deficient number, since it is larger than the sum of its proper divisors (6432315).

9816645 is a wasteful number, since it uses less digits than its factorization.

9816645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22604.

The product of its digits is 51840, while the sum is 39.

The square root of 9816645 is about 3133.1525657076. The cubic root of 9816645 is about 214.1185836498.

It can be divided in two parts, 981 and 6645, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 9816645 in words is "nine million, eight hundred sixteen thousand, six hundred forty-five".