133860 has 48 divisors (see below), whose sum is σ = 395136. Its totient is φ = 33792.

The previous prime is 133853. The next prime is 133873. The reversal of 133860 is 68331.

133860 = 65² + 66² + ... + 87².

It is an unprimeable number.

133860 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, 1332 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (8232).

2¹³³⁸⁶⁰ is an apocalyptic number.

133860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197568).

133860 is an abundant number, since it is smaller than the sum of its proper divisors (261276).

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

133860 is a wasteful number, since it uses less digits than its factorization.

133860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 133860 is about 365.8688289538. The cubic root of 133860 is about 51.1544720603.

The spelling of 133860 in words is "one hundred thirty-three thousand, eight hundred sixty".