8989721 has 8 divisors (see below), whose sum is σ = 9993984. Its totient is φ = 8030160.

The previous prime is 8989703. The next prime is 8989723. The reversal of 8989721 is 1279898.

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

It is a cyclic number.

It is not a de Polignac number, because 8989721 - 2¹⁸ = 8727577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8989723) 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, 10751 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (1249248).

Almost surely, 2^8989721 is an apocalyptic number.

It is an amenable number.

8989721 is a deficient number, since it is larger than the sum of its proper divisors (1004263).

8989721 is a wasteful number, since it uses less digits than its factorization.

8989721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22351.

The product of its digits is 72576, while the sum is 44.

The square root of 8989721 is about 2998.2863438971. The cubic root of 8989721 is about 207.9291625767.

The spelling of 8989721 in words is "eight million, nine hundred eighty-nine thousand, seven hundred twenty-one".