129452172 has 48 divisors (see below), whose sum is σ = 313592160. Its totient is φ = 41513472.

The previous prime is 129452117. The next prime is 129452173. The reversal of 129452172 is 271254921.

It is not an unprimeable number, because it can be changed into a prime (129452173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137688 + ... + 138624.

It is an arithmetic number, because the mean of its divisors is an integer number (6533170).

Almost surely, 2^129452172 is an apocalyptic number.

129452172 is a gapful number since it is divisible by the number (12) 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 129452172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156796080).

129452172 is an abundant number, since it is smaller than the sum of its proper divisors (184139988).

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

129452172 is a wasteful number, since it uses less digits than its factorization.

129452172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1368 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 129452172 is about 11377.7050410001. The cubic root of 129452172 is about 505.8671139950.

The spelling of 129452172 in words is "one hundred twenty-nine million, four hundred fifty-two thousand, one hundred seventy-two".