303666 has 32 divisors (see below), whose sum is σ = 684288. Its totient is φ = 89040.

The previous prime is 303649. The next prime is 303679. The reversal of 303666 is 666303.

It is an unprimeable number.

303666 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 15 ways as a sum of consecutive naturals, for example, 2785 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (21384).

2³⁰³⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 303666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342144).

303666 is an abundant number, since it is smaller than the sum of its proper divisors (380622).

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

303666 is a wasteful number, since it uses less digits than its factorization.

303666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 303666 is about 551.0589805093. The cubic root of 303666 is about 67.2148741168.

Adding to 303666 its reverse (666303), we get a palindrome (969969).

It can be divided in two parts, 303 and 666, that added together give a palindrome (969).

The spelling of 303666 in words is "three hundred three thousand, six hundred sixty-six".