6647239 has 2 divisors, whose sum is σ = 6647240. Its totient is φ = 6647238.

The previous prime is 6647227. The next prime is 6647243. The reversal of 6647239 is 9327466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6647239 - 2⁷ = 6647111 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6647198 and 6647207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323619 + 3323620.

It is an arithmetic number, because the mean of its divisors is an integer number (3323620).

Almost surely, 2^6647239 is an apocalyptic number.

6647239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647239 is an equidigital number, since it uses as much as digits as its factorization.

6647239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 37.

The square root of 6647239 is about 2578.2240011295. The cubic root of 6647239 is about 188.0242065556.

It can be divided in two parts, 6647 and 239, that added together give a palindrome (6886).

The spelling of 6647239 in words is "six million, six hundred forty-seven thousand, two hundred thirty-nine".