129923 has 4 divisors (see below), whose sum is σ = 130848. Its totient is φ = 129000.

The previous prime is 129919. The next prime is 129937. The reversal of 129923 is 329921.

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: 329921 = 359 ⋅919.

It is a cyclic number.

It is not a de Polignac number, because 129923 - 2² = 129919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129892 and 129901.

It is not an unprimeable number, because it can be changed into a prime (129953) 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 3 ways as a sum of consecutive naturals, for example, 203 + ... + 548.

It is an arithmetic number, because the mean of its divisors is an integer number (32712).

2¹²⁹⁹²³ is an apocalyptic number.

129923 is a deficient number, since it is larger than the sum of its proper divisors (925).

129923 is an equidigital number, since it uses as much as digits as its factorization.

129923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its digits is 972, while the sum is 26.

The square root of 129923 is about 360.4483319423. The cubic root of 129923 is about 50.6479665139.

The spelling of 129923 in words is "one hundred twenty-nine thousand, nine hundred twenty-three".