133885 has 4 divisors (see below), whose sum is σ = 160668. Its totient is φ = 107104.

The previous prime is 133877. The next prime is 133919. The reversal of 133885 is 588331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588331 = 263 ⋅2237.

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 101124 = 181^2 + 318^2 .

It is a cyclic number.

It is not a de Polignac number, because 133885 - 2³ = 133877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13384 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (40167).

2¹³³⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

133885 is a deficient number, since it is larger than the sum of its proper divisors (26783).

133885 is an equidigital number, since it uses as much as digits as its factorization.

133885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26782.

The product of its digits is 2880, while the sum is 28.

The square root of 133885 is about 365.9029926087. The cubic root of 133885 is about 51.1576564375.

It can be divided in two parts, 13 and 3885, that multiplied together give a palindrome (50505).

The spelling of 133885 in words is "one hundred thirty-three thousand, eight hundred eighty-five".