129147136 has 36 divisors (see below), whose sum is σ = 259825104. Its totient is φ = 64064000.

The previous prime is 129147127. The next prime is 129147143. The reversal of 129147136 is 631741921.

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, 31611 + ... + 35461.

It is an arithmetic number, because the mean of its divisors is an integer number (7217364).

Almost surely, 2^129147136 is an apocalyptic number.

129147136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129147136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129912552).

129147136 is an abundant number, since it is smaller than the sum of its proper divisors (130677968).

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

129147136 is an equidigital number, since it uses as much as digits as its factorization.

129147136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3984 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 129147136 is about 11364.2921468959. The cubic root of 129147136 is about 505.4694663824.

The spelling of 129147136 in words is "one hundred twenty-nine million, one hundred forty-seven thousand, one hundred thirty-six".