8998721 has 8 divisors (see below), whose sum is σ = 9290400. Its totient is φ = 8710560.

The previous prime is 8998709. The next prime is 8998747. The reversal of 8998721 is 1278998.

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 8998721 - 2⁶ = 8998657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8998771) 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, 4910 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1161300).

Almost surely, 2^8998721 is an apocalyptic number.

It is an amenable number.

8998721 is a deficient number, since it is larger than the sum of its proper divisors (291679).

8998721 is a wasteful number, since it uses less digits than its factorization.

8998721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

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

The square root of 8998721 is about 2999.7868257595. The cubic root of 8998721 is about 207.9985284043.

The spelling of 8998721 in words is "eight million, nine hundred ninety-eight thousand, seven hundred twenty-one".