129123132 has 12 divisors (see below), whose sum is σ = 301287336. Its totient is φ = 43041040.

The previous prime is 129123131. The next prime is 129123139. The reversal of 129123132 is 231321921.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129123131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380119 + ... + 5380142.

It is an arithmetic number, because the mean of its divisors is an integer number (25107278).

Almost surely, 2^129123132 is an apocalyptic number.

129123132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129123132 is an abundant number, since it is smaller than the sum of its proper divisors (172164204).

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

129123132 is a wasteful number, since it uses less digits than its factorization.

129123132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10760268 (or 10760266 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 129123132 is about 11363.2359827648. The cubic root of 129123132 is about 505.4381479931.

The spelling of 129123132 in words is "one hundred twenty-nine million, one hundred twenty-three thousand, one hundred thirty-two".