297666 has 24 divisors (see below), whose sum is σ = 673920. Its totient is φ = 94776.

The previous prime is 297659. The next prime is 297683. The reversal of 297666 is 666792.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹¹ + 9² + 6⁵ + 7² + 6⁵ + 6⁷ .

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 297666.

It is an unprimeable number.

297666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (28080).

2²⁹⁷⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 297666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336960).

297666 is an abundant number, since it is smaller than the sum of its proper divisors (376254).

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

297666 is a wasteful number, since it uses less digits than its factorization.

297666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 747 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 297666 is about 545.5877564609. The cubic root of 297666 is about 66.7692365548.

The spelling of 297666 in words is "two hundred ninety-seven thousand, six hundred sixty-six".