2643239 has 2 divisors, whose sum is σ = 2643240. Its totient is φ = 2643238.

The previous prime is 2643227. The next prime is 2643241. The reversal of 2643239 is 9323462.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643239 is a prime.

It is a super-2 number, since 2×2643239² = 13973424822242, which contains 22 as substring.

Together with 2643241, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2 + 6³ + 4¹⁰ + 3⁴ + 2⁵ + 3¹³ + 9 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321619 + 1321620.

It is an arithmetic number, because the mean of its divisors is an integer number (1321620).

2^2643239 is an apocalyptic number.

2643239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643239 is an equidigital number, since it uses as much as digits as its factorization.

2643239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 2643239 is about 1625.8041087413. The cubic root of 2643239 is about 138.2649638762.

It can be divided in two parts, 2643 and 239, that added together give a palindrome (2882).

The spelling of 2643239 in words is "two million, six hundred forty-three thousand, two hundred thirty-nine".