665493 has 4 divisors (see below), whose sum is σ = 887328. Its totient is φ = 443660.

The previous prime is 665479. The next prime is 665501. The reversal of 665493 is 394566.

It is a happy number.

665493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 665493 - 2⁶ = 665429 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665293) 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, 110913 + ... + 110918.

It is an arithmetic number, because the mean of its divisors is an integer number (221832).

2⁶⁶⁵⁴⁹³ is an apocalyptic number.

It is an amenable number.

665493 is a deficient number, since it is larger than the sum of its proper divisors (221835).

665493 is a wasteful number, since it uses less digits than its factorization.

665493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221834.

The product of its digits is 19440, while the sum is 33.

The square root of 665493 is about 815.7775432065. Note that the first 3 decimals coincide. The cubic root of 665493 is about 87.3067517468.

The spelling of 665493 in words is "six hundred sixty-five thousand, four hundred ninety-three".