9489721 has 4 divisors (see below), whose sum is σ = 9989200. Its totient is φ = 8990244.

The previous prime is 9489719. The next prime is 9489763. The reversal of 9489721 is 1279849.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1279849 = 251 ⋅5099.

It is a cyclic number.

It is not a de Polignac number, because 9489721 - 2¹ = 9489719 is a prime.

It is a Duffinian number.

9489721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9489121) 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 3 ways as a sum of consecutive naturals, for example, 249711 + ... + 249748.

It is an arithmetic number, because the mean of its divisors is an integer number (2497300).

Almost surely, 2^9489721 is an apocalyptic number.

It is an amenable number.

9489721 is a deficient number, since it is larger than the sum of its proper divisors (499479).

9489721 is a wasteful number, since it uses less digits than its factorization.

9489721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499478.

The product of its digits is 36288, while the sum is 40.

The square root of 9489721 is about 3080.5390762008. The cubic root of 9489721 is about 211.7147656276.

The spelling of 9489721 in words is "nine million, four hundred eighty-nine thousand, seven hundred twenty-one".