129423235 has 4 divisors (see below), whose sum is σ = 155307888. Its totient is φ = 103538584.

The previous prime is 129423211. The next prime is 129423253. The reversal of 129423235 is 532324921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 532324921 = 8951 ⋅59471.

It is a cyclic number.

It is not a de Polignac number, because 129423235 - 2⁹ = 129422723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129423197 and 129423206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12942319 + ... + 12942328.

It is an arithmetic number, because the mean of its divisors is an integer number (38826972).

Almost surely, 2^129423235 is an apocalyptic number.

129423235 is a deficient number, since it is larger than the sum of its proper divisors (25884653).

129423235 is an equidigital number, since it uses as much as digits as its factorization.

129423235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25884652.

The product of its digits is 12960, while the sum is 31.

The square root of 129423235 is about 11376.4333162903. The cubic root of 129423235 is about 505.8294183032.

The spelling of 129423235 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, two hundred thirty-five".