129441726 has 48 divisors (see below), whose sum is σ = 293542704. Its totient is φ = 42747264.

The previous prime is 129441721. The next prime is 129441727. The reversal of 129441726 is 627144921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129441721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53740 + ... + 56096.

It is an arithmetic number, because the mean of its divisors is an integer number (6115473).

Almost surely, 2^129441726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129441726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146771352).

129441726 is an abundant number, since it is smaller than the sum of its proper divisors (164100978).

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

129441726 is a wasteful number, since it uses less digits than its factorization.

129441726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2475 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 129441726 is about 11377.2459760700. The cubic root of 129441726 is about 505.8535068330.

The spelling of 129441726 in words is "one hundred twenty-nine million, four hundred forty-one thousand, seven hundred twenty-six".