665239 has 2 divisors, whose sum is σ = 665240. Its totient is φ = 665238.

The previous prime is 665233. The next prime is 665251. The reversal of 665239 is 932566.

665239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665239 - 2⁵ = 665207 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁴ + 6⁴ + 2¹⁷ + 5³ + 3¹² + 9 .

It is a self number, because there is not a number n which added to its sum of digits gives 665239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332619 + 332620.

It is an arithmetic number, because the mean of its divisors is an integer number (332620).

2⁶⁶⁵²³⁹ is an apocalyptic number.

665239 is a deficient number, since it is larger than the sum of its proper divisors (1).

665239 is an equidigital number, since it uses as much as digits as its factorization.

665239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 665239 is about 815.6218486529. The cubic root of 665239 is about 87.2956428211.

The spelling of 665239 in words is "six hundred sixty-five thousand, two hundred thirty-nine".