201866 has 8 divisors (see below), whose sum is σ = 346080. Its totient is φ = 86508.

The previous prime is 201847. The next prime is 201881. The reversal of 201866 is 668102.

201866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 7196 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (43260).

2²⁰¹⁸⁶⁶ is an apocalyptic number.

201866 is a deficient number, since it is larger than the sum of its proper divisors (144214).

201866 is a wasteful number, since it uses less digits than its factorization.

201866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14428.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 201866 is about 449.2950033107. The cubic root of 201866 is about 58.6616659535.

Adding to 201866 its reverse (668102), we get a palindrome (869968).

The spelling of 201866 in words is "two hundred one thousand, eight hundred sixty-six".