129142 has 8 divisors (see below), whose sum is σ = 208656. Its totient is φ = 59592.

The previous prime is 129127. The next prime is 129169. The reversal of 129142 is 241921.

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

It is a congruent number.

It is an unprimeable number.

129142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2458 + ... + 2509.

It is an arithmetic number, because the mean of its divisors is an integer number (26082).

2¹²⁹¹⁴² is an apocalyptic number.

129142 is a deficient number, since it is larger than the sum of its proper divisors (79514).

129142 is a wasteful number, since it uses less digits than its factorization.

129142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4982.

The product of its digits is 144, while the sum is 19.

The square root of 129142 is about 359.3633258973. The cubic root of 129142 is about 50.5462765690.

Adding to 129142 its product of digits (144), we get a triangular number (129286 = T₅₀₈).

The spelling of 129142 in words is "one hundred twenty-nine thousand, one hundred forty-two".