8722209 has 8 divisors (see below), whose sum is σ = 11694592. Its totient is φ = 5782320.

The previous prime is 8722193. The next prime is 8722211. The reversal of 8722209 is 9022278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8722209 - 2⁴ = 8722193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8722009) 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, 7489 + ... + 8574.

It is an arithmetic number, because the mean of its divisors is an integer number (1461824).

Almost surely, 2^8722209 is an apocalyptic number.

It is an amenable number.

8722209 is a deficient number, since it is larger than the sum of its proper divisors (2972383).

8722209 is a wasteful number, since it uses less digits than its factorization.

8722209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16247.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 8722209 is about 2953.3386192579. The cubic root of 8722209 is about 205.8458723951.

It can be divided in two parts, 872 and 2209, that added together give a triangular number (3081 = T₇₈).

The spelling of 8722209 in words is "eight million, seven hundred twenty-two thousand, two hundred nine".