129424142 has 4 divisors (see below), whose sum is σ = 194136216. Its totient is φ = 64712070.

The previous prime is 129424123. The next prime is 129424147. The reversal of 129424142 is 241424921.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129424147) by changing a digit.

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 as a sum of consecutive naturals, namely, 32356034 + ... + 32356037.

It is an arithmetic number, because the mean of its divisors is an integer number (48534054).

Almost surely, 2^129424142 is an apocalyptic number.

129424142 is a deficient number, since it is larger than the sum of its proper divisors (64712074).

129424142 is an equidigital number, since it uses as much as digits as its factorization.

129424142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64712073.

The product of its digits is 4608, while the sum is 29.

The square root of 129424142 is about 11376.4731793293. The cubic root of 129424142 is about 505.8305999205.

The spelling of 129424142 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, one hundred forty-two".