8421856 has 12 divisors (see below), whose sum is σ = 16580592. Its totient is φ = 4210912.

The previous prime is 8421839. The next prime is 8421857. The reversal of 8421856 is 6581248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131560 + ... + 131623.

It is an arithmetic number, because the mean of its divisors is an integer number (1381716).

Almost surely, 2^8421856 is an apocalyptic number.

It is an amenable number.

8421856 is a deficient number, since it is larger than the sum of its proper divisors (8158736).

8421856 is a wasteful number, since it uses less digits than its factorization.

8421856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263193 (or 263185 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 8421856 is about 2902.0434180074. The cubic root of 8421856 is about 203.4554231092.

The spelling of 8421856 in words is "eight million, four hundred twenty-one thousand, eight hundred fifty-six".