2543855 has 4 divisors (see below), whose sum is σ = 3052632. Its totient is φ = 2035080.

The previous prime is 2543843. The next prime is 2543873. The reversal of 2543855 is 5583452.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2543855 - 2¹⁸ = 2281711 is a prime.

It is a super-2 number, since 2×2543855² = 12942396522050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254381 + ... + 254390.

It is an arithmetic number, because the mean of its divisors is an integer number (763158).

2^2543855 is an apocalyptic number.

2543855 is a deficient number, since it is larger than the sum of its proper divisors (508777).

2543855 is an equidigital number, since it uses as much as digits as its factorization.

2543855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508776.

The product of its digits is 24000, while the sum is 32.

The square root of 2543855 is about 1594.9467075736. The cubic root of 2543855 is about 136.5098902878.

The spelling of 2543855 in words is "two million, five hundred forty-three thousand, eight hundred fifty-five".