665226 has 32 divisors (see below), whose sum is σ = 1505280. Its totient is φ = 217728.

The previous prime is 665221. The next prime is 665233. The reversal of 665226 is 622566.

665226 is a `hidden beast` number, since 6 + 652 + 2 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 665226.

It is not an unprimeable number, because it can be changed into a prime (665221) by changing a digit.

665226 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5175 + ... + 5301.

It is an arithmetic number, because the mean of its divisors is an integer number (47040).

2⁶⁶⁵²²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752640).

665226 is an abundant number, since it is smaller than the sum of its proper divisors (840054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665226 is a wasteful number, since it uses less digits than its factorization.

665226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 229 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 665226 is about 815.6138792345. The cubic root of 665226 is about 87.2950741780.

The spelling of 665226 in words is "six hundred sixty-five thousand, two hundred twenty-six".