7921856 has 28 divisors (see below), whose sum is σ = 16108680. Its totient is φ = 3863040.

The previous prime is 7921831. The next prime is 7921861. The reversal of 7921856 is 6581297.

It is a d-powerful number, because it can be written as 7⁸ + 9⁵ + 2²¹ + 1 + 8³ + 5³ + 6³ .

It is a zygodrome in base 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, 1115 + ... + 4133.

It is an arithmetic number, because the mean of its divisors is an integer number (575310).

Almost surely, 2^7921856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8054340).

7921856 is an abundant number, since it is smaller than the sum of its proper divisors (8186824).

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

7921856 is a wasteful number, since it uses less digits than its factorization.

7921856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072 (or 3062 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 7921856 is about 2814.5791870189. The cubic root of 7921856 is about 199.3466681111.

The spelling of 7921856 in words is "seven million, nine hundred twenty-one thousand, eight hundred fifty-six".