8721273 has 16 divisors (see below), whose sum is σ = 12957696. Its totient is φ = 5172240.

The previous prime is 8721269. The next prime is 8721281. The reversal of 8721273 is 3721278.

It is not a de Polignac number, because 8721273 - 2² = 8721269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8721273.

It is not an unprimeable number, because it can be changed into a prime (8721253) 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 15 ways as a sum of consecutive naturals, for example, 1261 + ... + 4362.

It is an arithmetic number, because the mean of its divisors is an integer number (809856).

Almost surely, 2^8721273 is an apocalyptic number.

It is an amenable number.

8721273 is a deficient number, since it is larger than the sum of its proper divisors (4236423).

8721273 is a wasteful number, since it uses less digits than its factorization.

8721273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684.

The product of its digits is 4704, while the sum is 30.

The square root of 8721273 is about 2953.1801502787. The cubic root of 8721273 is about 205.8385088694.

It can be divided in two parts, 872 and 1273, that added together give a triangular number (2145 = T₆₅).

The spelling of 8721273 in words is "eight million, seven hundred twenty-one thousand, two hundred seventy-three".