2543845 has 8 divisors (see below), whose sum is σ = 3127320. Its totient is φ = 1985280.

The previous prime is 2543843. The next prime is 2543873. The reversal of 2543845 is 5483452.

2543845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 2362369 = 426^2 + 1537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2543845 - 2¹ = 2543843 is a prime.

It is a super-2 number, since 2×2543845² = 12942294768050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 5³ + 4² + 3⁵ + 8³ + 4⁸ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6000 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (390915).

2^2543845 is an apocalyptic number.

It is an amenable number.

2543845 is a deficient number, since it is larger than the sum of its proper divisors (583475).

2543845 is a wasteful number, since it uses less digits than its factorization.

2543845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12455.

The product of its digits is 19200, while the sum is 31.

The square root of 2543845 is about 1594.9435726696. The cubic root of 2543845 is about 136.5097114122.

The spelling of 2543845 in words is "two million, five hundred forty-three thousand, eight hundred forty-five".