9766721 has 8 divisors (see below), whose sum is σ = 10396800. Its totient is φ = 9142848.

The previous prime is 9766711. The next prime is 9766739. The reversal of 9766721 is 1276679.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9766721 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (9766711) 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, 1940 + ... + 4826.

It is an arithmetic number, because the mean of its divisors is an integer number (1299600).

Almost surely, 2^9766721 is an apocalyptic number.

It is an amenable number.

9766721 is a deficient number, since it is larger than the sum of its proper divisors (630079).

9766721 is a wasteful number, since it uses less digits than its factorization.

9766721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103.

The product of its digits is 31752, while the sum is 38.

The square root of 9766721 is about 3125.1753550801. The cubic root of 9766721 is about 213.7549893390.

The spelling of 9766721 in words is "nine million, seven hundred sixty-six thousand, seven hundred twenty-one".