8721447 has 16 divisors (see below), whose sum is σ = 13719552. Its totient is φ = 4822560.

The previous prime is 8721443. The next prime is 8721467. The reversal of 8721447 is 7441278.

8721447 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8721447 - 2² = 8721443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6048 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (857472).

Almost surely, 2^8721447 is an apocalyptic number.

8721447 is a deficient number, since it is larger than the sum of its proper divisors (4998105).

8721447 is a wasteful number, since it uses less digits than its factorization.

8721447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13438.

The product of its digits is 12544, while the sum is 33.

The square root of 8721447 is about 2953.2096098990. The cubic root of 8721447 is about 205.8398777698.

The spelling of 8721447 in words is "eight million, seven hundred twenty-one thousand, four hundred forty-seven".