129725712 has 100 divisors (see below), whose sum is σ = 378100800. Its totient is φ = 42939072.

The previous prime is 129725707. The next prime is 129725747. The reversal of 129725712 is 217527921.

129725712 is a `hidden beast` number, since 12 + 9 + 72 + 571 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 257653 + ... + 258155.

It is an arithmetic number, because the mean of its divisors is an integer number (3781008).

Almost surely, 2^129725712 is an apocalyptic number.

129725712 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 129725712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189050400).

129725712 is an abundant number, since it is smaller than the sum of its proper divisors (248375088).

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

129725712 is a wasteful number, since it uses less digits than its factorization.

129725712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 707 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 129725712 is about 11389.7195751256. The cubic root of 129725712 is about 506.2231722409.

The spelling of 129725712 in words is "one hundred twenty-nine million, seven hundred twenty-five thousand, seven hundred twelve".