133923 has 4 divisors (see below), whose sum is σ = 178568. Its totient is φ = 89280.

The previous prime is 133919. The next prime is 133949. The reversal of 133923 is 329331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 133923 - 2² = 133919 is a prime.

It is a D-number.

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 133923.

It is not an unprimeable number, because it can be changed into a prime (133963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22318 + ... + 22323.

It is an arithmetic number, because the mean of its divisors is an integer number (44642).

2¹³³⁹²³ is an apocalyptic number.

133923 is a deficient number, since it is larger than the sum of its proper divisors (44645).

133923 is an equidigital number, since it uses as much as digits as its factorization.

133923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44644.

The product of its digits is 486, while the sum is 21.

The square root of 133923 is about 365.9549152560. The cubic root of 133923 is about 51.1624959317.

The spelling of 133923 in words is "one hundred thirty-three thousand, nine hundred twenty-three".