9789945 has 16 divisors (see below), whose sum is σ = 17088192. Its totient is φ = 4746560.

The previous prime is 9789937. The next prime is 9789947. The reversal of 9789945 is 5499879.

9789945 = T₆₃₇ + T₆₃₈ + ... + T₆₈₁.

It is a happy number.

It is not a de Polignac number, because 9789945 - 2³ = 9789937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9789947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29502 + ... + 29831.

It is an arithmetic number, because the mean of its divisors is an integer number (1068012).

Almost surely, 2^9789945 is an apocalyptic number.

It is an amenable number.

9789945 is a deficient number, since it is larger than the sum of its proper divisors (7298247).

9789945 is a wasteful number, since it uses less digits than its factorization.

9789945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59352.

The product of its digits is 816480, while the sum is 51.

The square root of 9789945 is about 3128.8887803819. Note that the first 3 decimals coincide. The cubic root of 9789945 is about 213.9242824683.

The spelling of 9789945 in words is "nine million, seven hundred eighty-nine thousand, nine hundred forty-five".