8818209 has 24 divisors (see below), whose sum is σ = 13127400. Its totient is φ = 5702400.

The previous prime is 8818207. The next prime is 8818211. The reversal of 8818209 is 9028188.

It is an interprime number because it is at equal distance from previous prime (8818207) and next prime (8818211).

It can be written as a sum of positive squares in 4 ways, for example, as 2985984 + 5832225 = 1728^2 + 2415^2 .

It is not a de Polignac number, because 8818209 - 2¹ = 8818207 is a prime.

It is a Curzon number.

8818209 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8818207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80847 + ... + 80955.

It is an arithmetic number, because the mean of its divisors is an integer number (546975).

Almost surely, 2^8818209 is an apocalyptic number.

8818209 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8818209 is a deficient number, since it is larger than the sum of its proper divisors (4309191).

8818209 is a wasteful number, since it uses less digits than its factorization.

8818209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 8818209 is about 2969.5469351401. The cubic root of 8818209 is about 206.5983248996.

The spelling of 8818209 in words is "eight million, eight hundred eighteen thousand, two hundred nine".