133845 has 8 divisors (see below), whose sum is σ = 214176. Its totient is φ = 71376.

The previous prime is 133843. The next prime is 133853. The reversal of 133845 is 548331.

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

It is not a de Polignac number, because 133845 - 2¹ = 133843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4447 + ... + 4476.

It is an arithmetic number, because the mean of its divisors is an integer number (26772).

2¹³³⁸⁴⁵ is an apocalyptic number.

133845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133845 is a deficient number, since it is larger than the sum of its proper divisors (80331).

133845 is an equidigital number, since it uses as much as digits as its factorization.

133845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8931.

The product of its digits is 1440, while the sum is 24.

The square root of 133845 is about 365.8483292295. The cubic root of 133845 is about 51.1525612437.

The spelling of 133845 in words is "one hundred thirty-three thousand, eight hundred forty-five".