2543556 has 24 divisors (see below), whose sum is σ = 5985280. Its totient is φ = 840672.

The previous prime is 2543551. The next prime is 2543573. The reversal of 2543556 is 6553452.

It is not an unprimeable number, because it can be changed into a prime (2543551) 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, 690 + ... + 2358.

2^2543556 is an apocalyptic number.

It is an amenable number.

2543556 is an abundant number, since it is smaller than the sum of its proper divisors (3441724).

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

2543556 is a wasteful number, since it uses less digits than its factorization.

2543556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803 (or 1801 counting only the distinct ones).

The product of its digits is 18000, while the sum is 30.

The square root of 2543556 is about 1594.8529712798. The cubic root of 2543556 is about 136.5045417051.

The spelling of 2543556 in words is "two million, five hundred forty-three thousand, five hundred fifty-six".