129342128 has 20 divisors (see below), whose sum is σ = 253186920. Its totient is φ = 64003584.

The previous prime is 129342119. The next prime is 129342209. The reversal of 129342128 is 821243921.

It is a junction number, because it is equal to n+sod(n) for n = 129342094 and 129342103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40118 + ... + 43221.

It is an arithmetic number, because the mean of its divisors is an integer number (12659346).

Almost surely, 2^129342128 is an apocalyptic number.

It is an amenable number.

129342128 is a deficient number, since it is larger than the sum of its proper divisors (123844792).

129342128 is an equidigital number, since it uses as much as digits as its factorization.

129342128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83444 (or 83438 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 129342128 is about 11372.8680639494. The cubic root of 129342128 is about 505.7237317683.

The spelling of 129342128 in words is "one hundred twenty-nine million, three hundred forty-two thousand, one hundred twenty-eight".