129439212 has 48 divisors (see below), whose sum is σ = 345999360. Its totient is φ = 36893952.

The previous prime is 129439187. The next prime is 129439217. The reversal of 129439212 is 212934921.

It is not an unprimeable number, because it can be changed into a prime (129439217) 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 in 15 ways as a sum of consecutive naturals, for example, 38628 + ... + 41844.

It is an arithmetic number, because the mean of its divisors is an integer number (7208320).

Almost surely, 2^129439212 is an apocalyptic number.

129439212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129439212 is an abundant number, since it is smaller than the sum of its proper divisors (216560148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129439212 is a wasteful number, since it uses less digits than its factorization.

129439212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710 (or 3708 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 129439212 is about 11377.1354918538. The cubic root of 129439212 is about 505.8502319386.

It can be divided in two parts, 12943 and 9212, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 129439212 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, two hundred twelve".