665339 has 4 divisors (see below), whose sum is σ = 680856. Its totient is φ = 649824.

The previous prime is 665311. The next prime is 665351. The reversal of 665339 is 933566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665339 - 2¹⁶ = 599803 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665339.

It is not an unprimeable number, because it can be changed into a prime (665359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7694 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (170214).

2⁶⁶⁵³³⁹ is an apocalyptic number.

665339 is a deficient number, since it is larger than the sum of its proper divisors (15517).

665339 is a wasteful number, since it uses less digits than its factorization.

665339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15516.

The product of its digits is 14580, while the sum is 32.

The square root of 665339 is about 815.6831492681. The cubic root of 665339 is about 87.3000167513.

The spelling of 665339 in words is "six hundred sixty-five thousand, three hundred thirty-nine".