129123 has 6 divisors (see below), whose sum is σ = 186524. Its totient is φ = 86076.

The previous prime is 129121. The next prime is 129127. The reversal of 129123 is 321921.

It is a happy number.

It is not a de Polignac number, because 129123 - 2¹ = 129121 is a prime.

It is a Duffinian number.

129123 is a lucky number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 129096 and 129105.

It is not an unprimeable number, because it can be changed into a prime (129121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7165 + ... + 7182.

2¹²⁹¹²³ is an apocalyptic number.

129123 is a deficient number, since it is larger than the sum of its proper divisors (57401).

129123 is a wasteful number, since it uses less digits than its factorization.

129123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14353 (or 14350 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 129123 is about 359.3368892836. The cubic root of 129123 is about 50.5437975760.

It can be divided in two parts, 129 and 123, that added together give a palindrome (252).

The spelling of 129123 in words is "one hundred twenty-nine thousand, one hundred twenty-three".