133818 has 8 divisors (see below), whose sum is σ = 267648. Its totient is φ = 44604.

The previous prime is 133813. The next prime is 133831. The reversal of 133818 is 818331.

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

133818 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133811) by changing a digit.

133818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11146 + ... + 11157.

It is an arithmetic number, because the mean of its divisors is an integer number (33456).

2¹³³⁸¹⁸ is an apocalyptic number.

133818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

133818 is a wasteful number, since it uses less digits than its factorization.

133818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22308.

The product of its digits is 576, while the sum is 24.

The square root of 133818 is about 365.8114268308. The cubic root of 133818 is about 51.1491214139.

The spelling of 133818 in words is "one hundred thirty-three thousand, eight hundred eighteen".