665039 has 2 divisors, whose sum is σ = 665040. Its totient is φ = 665038.

The previous prime is 665029. The next prime is 665047. The reversal of 665039 is 930566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332519 + 332520.

It is an arithmetic number, because the mean of its divisors is an integer number (332520).

2⁶⁶⁵⁰³⁹ is an apocalyptic number.

665039 is a deficient number, since it is larger than the sum of its proper divisors (1).

665039 is an equidigital number, since it uses as much as digits as its factorization.

665039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 665039 is about 815.4992335987. The cubic root of 665039 is about 87.2868936455.

The spelling of 665039 in words is "six hundred sixty-five thousand, thirty-nine".