133879 has 4 divisors (see below), whose sum is σ = 135576. Its totient is φ = 132184.

The previous prime is 133877. The next prime is 133919. The reversal of 133879 is 978331.

133879 = T₁₀ + T₁₁ + ... + T₉₂.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978331 = 283 ⋅3457.

It is a cyclic number.

It is not a de Polignac number, because 133879 - 2¹ = 133877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133879.

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 3 ways as a sum of consecutive naturals, for example, 724 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (33894).

2¹³³⁸⁷⁹ is an apocalyptic number.

133879 is a deficient number, since it is larger than the sum of its proper divisors (1697).

133879 is an equidigital number, since it uses as much as digits as its factorization.

133879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696.

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

The square root of 133879 is about 365.8947936224. The cubic root of 133879 is about 51.1568922231.

The spelling of 133879 in words is "one hundred thirty-three thousand, eight hundred seventy-nine".