129129612 has 12 divisors (see below), whose sum is σ = 301302456. Its totient is φ = 43043200.

The previous prime is 129129607. The next prime is 129129629. The reversal of 129129612 is 216921921.

It is a tau number, because it is divible by the number of its divisors (12).

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, 5380389 + ... + 5380412.

It is an arithmetic number, because the mean of its divisors is an integer number (25108538).

Almost surely, 2^129129612 is an apocalyptic number.

129129612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129129612 is an abundant number, since it is smaller than the sum of its proper divisors (172172844).

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

129129612 is a wasteful number, since it uses less digits than its factorization.

129129612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10760808 (or 10760806 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 129129612 is about 11363.5211092337. The cubic root of 129129612 is about 505.4466029315.

It can be divided in two parts, 1291 and 29612, that added together give a palindrome (30903).

The spelling of 129129612 in words is "one hundred twenty-nine million, one hundred twenty-nine thousand, six hundred twelve".