2543856 has 80 divisors (see below), whose sum is σ = 7689984. Its totient is φ = 709632.

The previous prime is 2543843. The next prime is 2543873. The reversal of 2543856 is 6583452.

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

Its product of digits (28800) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22456 + ... + 22568.

2^2543856 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 2543856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3844992).

2543856 is an abundant number, since it is smaller than the sum of its proper divisors (5146128).

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

2543856 is a wasteful number, since it uses less digits than its factorization.

2543856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 192 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 2543856 is about 1594.9470210637. The cubic root of 2543856 is about 136.5099081753.

The spelling of 2543856 in words is "two million, five hundred forty-three thousand, eight hundred fifty-six".