665393 has 4 divisors (see below), whose sum is σ = 670320. Its totient is φ = 660468.

The previous prime is 665387. The next prime is 665419. The reversal of 665393 is 393566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665393 - 2¹⁰ = 664369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665303) 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, 2255 + ... + 2532.

It is an arithmetic number, because the mean of its divisors is an integer number (167580).

2⁶⁶⁵³⁹³ is an apocalyptic number.

It is an amenable number.

665393 is a deficient number, since it is larger than the sum of its proper divisors (4927).

665393 is a wasteful number, since it uses less digits than its factorization.

665393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926.

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

The square root of 665393 is about 815.7162496849. The cubic root of 665393 is about 87.3023784914.

The spelling of 665393 in words is "six hundred sixty-five thousand, three hundred ninety-three".