133855 has 8 divisors (see below), whose sum is σ = 169200. Its totient is φ = 101376.

The previous prime is 133853. The next prime is 133873. The reversal of 133855 is 558331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 133855 - 2¹ = 133853 is a prime.

It is a super-2 number, since 2×133855² = 35834322050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133853) 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, 610 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (21150).

2¹³³⁸⁵⁵ is an apocalyptic number.

133855 is a deficient number, since it is larger than the sum of its proper divisors (35345).

133855 is a wasteful number, since it uses less digits than its factorization.

133855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433.

The product of its digits is 1800, while the sum is 25.

The square root of 133855 is about 365.8619958400. The cubic root of 133855 is about 51.1538351373.

It can be divided in two parts, 1 and 33855, that added together give a square (33856 = 184²).

The spelling of 133855 in words is "one hundred thirty-three thousand, eight hundred fifty-five".