665946 has 12 divisors (see below), whose sum is σ = 1442922. Its totient is φ = 221976.

The previous prime is 665923. The next prime is 665947. The reversal of 665946 is 649566.

It is a happy number.

665946 is a `hidden beast` number, since 66 + 594 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 168921 = 705^2 + 411^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665946.

It is not an unprimeable number, because it can be changed into a prime (665947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18481 + ... + 18516.

2⁶⁶⁵⁹⁴⁶ is an apocalyptic number.

665946 is an abundant number, since it is smaller than the sum of its proper divisors (776976).

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

665946 is a wasteful number, since it uses less digits than its factorization.

665946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37005 (or 37002 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 665946 is about 816.0551451955. The cubic root of 665946 is about 87.3265571082.

The spelling of 665946 in words is "six hundred sixty-five thousand, nine hundred forty-six".