129105142 has 8 divisors (see below), whose sum is σ = 199904832. Its totient is φ = 62470200.

The previous prime is 129105139. The next prime is 129105143. The reversal of 129105142 is 241501921.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129105143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041109 + ... + 1041232.

It is an arithmetic number, because the mean of its divisors is an integer number (24988104).

Almost surely, 2^129105142 is an apocalyptic number.

129105142 is a deficient number, since it is larger than the sum of its proper divisors (70799690).

129105142 is a wasteful number, since it uses less digits than its factorization.

129105142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082374.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 129105142 is about 11362.4443673006. Note that the first 3 decimals coincide. The cubic root of 129105142 is about 505.4146736177.

The spelling of 129105142 in words is "one hundred twenty-nine million, one hundred five thousand, one hundred forty-two".