9668721 has 8 divisors (see below), whose sum is σ = 12959200. Its totient is φ = 6412032.

The previous prime is 9668719. The next prime is 9668741. The reversal of 9668721 is 1278669.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9668721 - 2¹ = 9668719 is a prime.

It is a Duffinian number.

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 9668721.

It is not an unprimeable number, because it can be changed into a prime (9668741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7771 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (1619900).

Almost surely, 2^9668721 is an apocalyptic number.

It is an amenable number.

9668721 is a deficient number, since it is larger than the sum of its proper divisors (3290479).

9668721 is a wasteful number, since it uses less digits than its factorization.

9668721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16895.

The product of its digits is 36288, while the sum is 39.

The square root of 9668721 is about 3109.4567049567. The cubic root of 9668721 is about 213.0376401994.

The spelling of 9668721 in words is "nine million, six hundred sixty-eight thousand, seven hundred twenty-one".