2543209 has 4 divisors (see below), whose sum is σ = 2625280. Its totient is φ = 2461140.

The previous prime is 2543201. The next prime is 2543221. The reversal of 2543209 is 9023452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2543209 - 2³ = 2543201 is a prime.

It is a d-powerful number, because it can be written as 2³ + 5⁹ + 4⁸ + 3⁵ + 2¹⁹ + 0 + 9 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40989 + ... + 41050.

It is an arithmetic number, because the mean of its divisors is an integer number (656320).

2^2543209 is an apocalyptic number.

It is an amenable number.

2543209 is a deficient number, since it is larger than the sum of its proper divisors (82071).

2543209 is an equidigital number, since it uses as much as digits as its factorization.

2543209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82070.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 2543209 is about 1594.7441801117. The cubic root of 2543209 is about 136.4983339615.

It can be divided in two parts, 25 and 43209, that added together give a palindrome (43234).

The spelling of 2543209 in words is "two million, five hundred forty-three thousand, two hundred nine".