9720306 has 48 divisors (see below), whose sum is σ = 22441536. Its totient is φ = 3033888.

The previous prime is 9720301. The next prime is 9720317. The reversal of 9720306 is 6030279.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9720306.

It is not an unprimeable number, because it can be changed into a prime (9720301) 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 23 ways as a sum of consecutive naturals, for example, 21721 + ... + 22163.

It is an arithmetic number, because the mean of its divisors is an integer number (467532).

Almost surely, 2^9720306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9720306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11220768).

9720306 is an abundant number, since it is smaller than the sum of its proper divisors (12721230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9720306 is a wasteful number, since it uses less digits than its factorization.

9720306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 9720306 is about 3117.7405280106. The cubic root of 9720306 is about 213.4158377713.

Subtracting from 9720306 its sum of digits (27), we obtain a palindrome (9720279).

The spelling of 9720306 in words is "nine million, seven hundred twenty thousand, three hundred six".