133887 has 8 divisors (see below), whose sum is σ = 192304. Its totient is φ = 82368.

The previous prime is 133877. The next prime is 133919. The reversal of 133887 is 788331.

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

It is not a de Polignac number, because 133887 - 2⁸ = 133631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1678 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (24038).

2¹³³⁸⁸⁷ is an apocalyptic number.

133887 is a deficient number, since it is larger than the sum of its proper divisors (58417).

133887 is a wasteful number, since it uses less digits than its factorization.

133887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449.

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

The square root of 133887 is about 365.9057255633. The cubic root of 133887 is about 51.1579111706.

The spelling of 133887 in words is "one hundred thirty-three thousand, eight hundred eighty-seven".