8698721 has 4 divisors (see below), whose sum is σ = 8711700. Its totient is φ = 8685744.

The previous prime is 8698699. The next prime is 8698727. The reversal of 8698721 is 1278968.

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 4950625 + 3748096 = 2225^2 + 1936^2 .

It is a cyclic number.

It is not a de Polignac number, because 8698721 - 2¹⁰ = 8697697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8698727) 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, 5426 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (2177925).

Almost surely, 2^8698721 is an apocalyptic number.

It is an amenable number.

8698721 is a deficient number, since it is larger than the sum of its proper divisors (12979).

8698721 is a wasteful number, since it uses less digits than its factorization.

8698721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978.

The product of its digits is 48384, while the sum is 41.

The square root of 8698721 is about 2949.3594219762. The cubic root of 8698721 is about 205.6609324591.

The spelling of 8698721 in words is "eight million, six hundred ninety-eight thousand, seven hundred twenty-one".