665893 has 8 divisors (see below), whose sum is σ = 709920. Its totient is φ = 622800.

The previous prime is 665857. The next prime is 665897. The reversal of 665893 is 398566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665893 - 2⁹ = 665381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1746 + ... + 2092.

It is an arithmetic number, because the mean of its divisors is an integer number (88740).

2⁶⁶⁵⁸⁹³ is an apocalyptic number.

It is an amenable number.

665893 is a deficient number, since it is larger than the sum of its proper divisors (44027).

665893 is a wasteful number, since it uses less digits than its factorization.

665893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its digits is 38880, while the sum is 37.

The square root of 665893 is about 816.0226712537. The cubic root of 665893 is about 87.3242403886.

Subtracting from 665893 its sum of digits (37), we obtain a square (665856 = 816²).

The spelling of 665893 in words is "six hundred sixty-five thousand, eight hundred ninety-three".