8908821 has 6 divisors (see below), whose sum is σ = 12868310. Its totient is φ = 5939208.

The previous prime is 8908819. The next prime is 8908877. The reversal of 8908821 is 1288098.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 562500 = 2889^2 + 750^2 .

It is not a de Polignac number, because 8908821 - 2¹ = 8908819 is a prime.

It is a super-3 number, since 3×8908821³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8908021) 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 5 ways as a sum of consecutive naturals, for example, 494926 + ... + 494943.

Almost surely, 2^8908821 is an apocalyptic number.

It is an amenable number.

8908821 is a deficient number, since it is larger than the sum of its proper divisors (3959489).

8908821 is a wasteful number, since it uses less digits than its factorization.

8908821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989875 (or 989872 counting only the distinct ones).

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

The square root of 8908821 is about 2984.7648148556. The cubic root of 8908821 is about 207.3035524016.

The spelling of 8908821 in words is "eight million, nine hundred eight thousand, eight hundred twenty-one".