129423 has 8 divisors (see below), whose sum is σ = 197248. Its totient is φ = 73944.

The previous prime is 129419. The next prime is 129439. The reversal of 129423 is 324921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129423 - 2² = 129419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6163 = 129423 / (1 + 2 + 9 + 4 + 2 + 3).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 129423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3061 + ... + 3102.

It is an arithmetic number, because the mean of its divisors is an integer number (24656).

2¹²⁹⁴²³ is an apocalyptic number.

129423 is a deficient number, since it is larger than the sum of its proper divisors (67825).

129423 is an equidigital number, since it uses as much as digits as its factorization.

129423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6173.

The product of its digits is 432, while the sum is 21.

The square root of 129423 is about 359.7540826732. The cubic root of 129423 is about 50.5829112150.

The spelling of 129423 in words is "one hundred twenty-nine thousand, four hundred twenty-three".