2543839 has 4 divisors (see below), whose sum is σ = 2562280. Its totient is φ = 2525400.

The previous prime is 2543833. The next prime is 2543843. The reversal of 2543839 is 9383452.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2543839 - 2⁹ = 2543327 is a prime.

It is a super-2 number, since 2×2543839² = 12942233715842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543833) by changing a digit.

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, 9012 + ... + 9289.

It is an arithmetic number, because the mean of its divisors is an integer number (640570).

2^2543839 is an apocalyptic number.

2543839 is a deficient number, since it is larger than the sum of its proper divisors (18441).

2543839 is a wasteful number, since it uses less digits than its factorization.

2543839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18440.

The product of its digits is 25920, while the sum is 34.

The square root of 2543839 is about 1594.9416917242. The cubic root of 2543839 is about 136.5096040866.

It can be divided in two parts, 254 and 3839, that multiplied together give a triangular number (975106 = T₁₃₉₆).

The spelling of 2543839 in words is "two million, five hundred forty-three thousand, eight hundred thirty-nine".