2921856 has 64 divisors (see below), whose sum is σ = 8878080. Its totient is φ = 834048.

The previous prime is 2921819. The next prime is 2921861. The reversal of 2921856 is 6581292.

It is a tau number, because it is divible by the number of its divisors (64).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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, 2145 + ... + 3231.

It is an arithmetic number, because the mean of its divisors is an integer number (138720).

2^2921856 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 2921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4439040).

2921856 is an abundant number, since it is smaller than the sum of its proper divisors (5956224).

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

2921856 is a wasteful number, since it uses less digits than its factorization.

2921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1099 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 2921856 is about 1709.3437337177. The cubic root of 2921856 is about 142.9616667427.

The spelling of 2921856 in words is "two million, nine hundred twenty-one thousand, eight hundred fifty-six".