8421008 has 20 divisors (see below), whose sum is σ = 16382508. Its totient is φ = 4193280.

The previous prime is 8420983. The next prime is 8421041. The reversal of 8421008 is 8001248.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 6012304 = 1552^2 + 2452^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560 + ... + 5432.

Almost surely, 2^8421008 is an apocalyptic number.

It is an amenable number.

8421008 is a deficient number, since it is larger than the sum of its proper divisors (7961500).

8421008 is a wasteful number, since it uses less digits than its factorization.

8421008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162 (or 2156 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 8421008 is about 2901.8973103816. The cubic root of 8421008 is about 203.4485942111.

The spelling of 8421008 in words is "eight million, four hundred twenty-one thousand, eight".