9766921 has 4 divisors (see below), whose sum is σ = 9782532. Its totient is φ = 9751312.

The previous prime is 9766909. The next prime is 9766937. The reversal of 9766921 is 1296679.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2368521 + 7398400 = 1539^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 9766921 - 2⁷ = 9766793 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9766901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6826 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (2445633).

Almost surely, 2^9766921 is an apocalyptic number.

It is an amenable number.

9766921 is a deficient number, since it is larger than the sum of its proper divisors (15611).

9766921 is a wasteful number, since it uses less digits than its factorization.

9766921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15610.

The product of its digits is 40824, while the sum is 40.

The square root of 9766921 is about 3125.2073531207. The cubic root of 9766921 is about 213.7564483993.

The spelling of 9766921 in words is "nine million, seven hundred sixty-six thousand, nine hundred twenty-one".