8421872 has 10 divisors (see below), whose sum is σ = 16317408. Its totient is φ = 4210928.

The previous prime is 8421857. The next prime is 8421877. The reversal of 8421872 is 2781248.

It is a d-powerful number, because it can be written as 8 + 4⁷ + 2²² + 1 + 8² + 7⁵ + 2²² .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263168 + ... + 263199.

Almost surely, 2^8421872 is an apocalyptic number.

It is an amenable number.

8421872 is a deficient number, since it is larger than the sum of its proper divisors (7895536).

8421872 is a wasteful number, since it uses less digits than its factorization.

8421872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526375 (or 526369 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 8421872 is about 2902.0461746843. The cubic root of 8421872 is about 203.4555519519.

The spelling of 8421872 in words is "eight million, four hundred twenty-one thousand, eight hundred seventy-two".