2543239 has 2 divisors, whose sum is σ = 2543240. Its totient is φ = 2543238.

The previous prime is 2543237. The next prime is 2543249. The reversal of 2543239 is 9323452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2543239 - 2¹ = 2543237 is a prime.

It is a super-2 number, since 2×2543239² = 12936129222242, which contains 22 as substring.

Together with 2543237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2543237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271619 + 1271620.

It is an arithmetic number, because the mean of its divisors is an integer number (1271620).

2^2543239 is an apocalyptic number.

2543239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543239 is an equidigital number, since it uses as much as digits as its factorization.

2543239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 2543239 is about 1594.7535859812. The cubic root of 2543239 is about 136.4988706763.

It can be divided in two parts, 25 and 43239, that added together give a square (43264 = 208²).

The spelling of 2543239 in words is "two million, five hundred forty-three thousand, two hundred thirty-nine".