9721206 has 48 divisors (see below), whose sum is σ = 23783760. Its totient is φ = 2842560.

The previous prime is 9721199. The next prime is 9721241. The reversal of 9721206 is 6021279.

9721206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9721206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4896 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (495495).

Almost surely, 2^9721206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9721206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11891880).

9721206 is an abundant number, since it is smaller than the sum of its proper divisors (14062554).

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

9721206 is a wasteful number, since it uses less digits than its factorization.

9721206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 9721206 is about 3117.8848599652. The cubic root of 9721206 is about 213.4224242693.

The spelling of 9721206 in words is "nine million, seven hundred twenty-one thousand, two hundred six".