2543816 has 32 divisors (see below), whose sum is σ = 5266080. Its totient is φ = 1142400.

The previous prime is 2543813. The next prime is 2543833. The reversal of 2543816 is 6183452.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11951 + ... + 12161.

It is an arithmetic number, because the mean of its divisors is an integer number (164565).

2^2543816 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 2543816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2633040).

2543816 is an abundant number, since it is smaller than the sum of its proper divisors (2722264).

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

2543816 is a wasteful number, since it uses less digits than its factorization.

2543816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 361 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 2543816 is about 1594.9344814130. The cubic root of 2543816 is about 136.5091926703.

The spelling of 2543816 in words is "two million, five hundred forty-three thousand, eight hundred sixteen".