8721473 has 2 divisors, whose sum is σ = 8721474. Its totient is φ = 8721472.

The previous prime is 8721469. The next prime is 8721481. The reversal of 8721473 is 3741278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4592449 + 4129024 = 2143^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 8721473 - 2² = 8721469 is a prime.

It is not a weakly prime, because it can be changed into another prime (8721403) 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 as a sum of consecutive naturals, namely, 4360736 + 4360737.

It is an arithmetic number, because the mean of its divisors is an integer number (4360737).

Almost surely, 2^8721473 is an apocalyptic number.

It is an amenable number.

8721473 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721473 is an equidigital number, since it uses as much as digits as its factorization.

8721473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 8721473 is about 2953.2140118860. The cubic root of 8721473 is about 205.8400823166.

The spelling of 8721473 in words is "eight million, seven hundred twenty-one thousand, four hundred seventy-three".