8712209 has 16 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 7392000.

The previous prime is 8712181. The next prime is 8712227. The reversal of 8712209 is 9022178.

It is a happy number.

It is not a de Polignac number, because 8712209 - 2⁸ = 8711953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8712229) 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, 9449 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^8712209 is an apocalyptic number.

It is an amenable number.

8712209 is a deficient number, since it is larger than the sum of its proper divisors (1448431).

8712209 is a wasteful number, since it uses less digits than its factorization.

8712209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8712209 is about 2951.6451344970. The cubic root of 8712209 is about 205.7671749803.

It can be divided in two parts, 8 and 712209, that added together give a palindrome (712217).

The spelling of 8712209 in words is "eight million, seven hundred twelve thousand, two hundred nine".