8428840 has 32 divisors (see below), whose sum is σ = 21674880. Its totient is φ = 2889792.

The previous prime is 8428811. The next prime is 8428867. The reversal of 8428840 is 488248.

8428840 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 8428796 and 8428805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14772 + ... + 15331.

It is an arithmetic number, because the mean of its divisors is an integer number (677340).

Almost surely, 2^8428840 is an apocalyptic number.

It is an amenable number.

8428840 is an abundant number, since it is smaller than the sum of its proper divisors (13246040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8428840 is a wasteful number, since it uses less digits than its factorization.

8428840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30121 (or 30117 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 8428840 is about 2903.2464587079. The cubic root of 8428840 is about 203.5116474568.

The spelling of 8428840 in words is "eight million, four hundred twenty-eight thousand, eight hundred forty".