133866 has 32 divisors (see below), whose sum is σ = 310080. Its totient is φ = 42768.

The previous prime is 133853. The next prime is 133873. The reversal of 133866 is 668331.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1965 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (9690).

2¹³³⁸⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155040).

133866 is an abundant number, since it is smaller than the sum of its proper divisors (176214).

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

133866 is a wasteful number, since it uses less digits than its factorization.

133866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 109 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 133866 is about 365.8770285219. The cubic root of 133866 is about 51.1552363470.

It can be divided in two parts, 133 and 866, that added together give a palindrome (999).

The spelling of 133866 in words is "one hundred thirty-three thousand, eight hundred sixty-six".