8421128 has 16 divisors (see below), whose sum is σ = 16476480. Its totient is φ = 4027408.

The previous prime is 8421079. The next prime is 8421143. The reversal of 8421128 is 8211248.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 8421097 and 8421106.

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, 22700 + ... + 23067.

It is an arithmetic number, because the mean of its divisors is an integer number (1029780).

Almost surely, 2^8421128 is an apocalyptic number.

It is an amenable number.

8421128 is a deficient number, since it is larger than the sum of its proper divisors (8055352).

8421128 is a wasteful number, since it uses less digits than its factorization.

8421128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45796 (or 45792 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 8421128 is about 2901.9179864359. The cubic root of 8421128 is about 203.4495605925.

It can be divided in two parts, 84 and 21128, that added together give a palindrome (21212).

The spelling of 8421128 in words is "eight million, four hundred twenty-one thousand, one hundred twenty-eight".