133889 has 8 divisors (see below), whose sum is σ = 158208. Its totient is φ = 110880.

The previous prime is 133877. The next prime is 133919. The reversal of 133889 is 988331.

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

It is not a de Polignac number, because 133889 - 2⁴ = 133873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92 + ... + 525.

It is an arithmetic number, because the mean of its divisors is an integer number (19776).

2¹³³⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

133889 is a deficient number, since it is larger than the sum of its proper divisors (24319).

133889 is an equidigital number, since it uses as much as digits as its factorization.

133889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its digits is 5184, while the sum is 32.

The square root of 133889 is about 365.9084584975. The cubic root of 133889 is about 51.1581659011.

The spelling of 133889 in words is "one hundred thirty-three thousand, eight hundred eighty-nine".