133789 has 4 divisors (see below), whose sum is σ = 134524. Its totient is φ = 133056.

The previous prime is 133781. The next prime is 133801. The reversal of 133789 is 987331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 987331 = 373 ⋅2647.

It can be written as a sum of positive squares in 2 ways, for example, as 62500 + 71289 = 250^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 133789 - 2³ = 133781 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 133789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (33631).

2¹³³⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

133789 is a deficient number, since it is larger than the sum of its proper divisors (735).

133789 is an equidigital number, since it uses as much as digits as its factorization.

133789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its digits is 4536, while the sum is 31.

The square root of 133789 is about 365.7717867742. The cubic root of 133789 is about 51.1454262666.

The spelling of 133789 in words is "one hundred thirty-three thousand, seven hundred eighty-nine".