133878 has 16 divisors (see below), whose sum is σ = 273456. Its totient is φ = 43680.

The previous prime is 133877. The next prime is 133919. The reversal of 133878 is 878331.

133878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133873) 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, 108 + ... + 528.

It is an arithmetic number, because the mean of its divisors is an integer number (17091).

2¹³³⁸⁷⁸ is an apocalyptic number.

133878 is an abundant number, since it is smaller than the sum of its proper divisors (139578).

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

133878 is a wasteful number, since it uses less digits than its factorization.

133878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 4032, while the sum is 30.

The square root of 133878 is about 365.8934271069. The cubic root of 133878 is about 51.1567648519.

The spelling of 133878 in words is "one hundred thirty-three thousand, eight hundred seventy-eight".