129381726 has 16 divisors (see below), whose sum is σ = 259513344. Its totient is φ = 43002264.

The previous prime is 129381719. The next prime is 129381751. The reversal of 129381726 is 627183921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28990 + ... + 33153.

It is an arithmetic number, because the mean of its divisors is an integer number (16219584).

Almost surely, 2^129381726 is an apocalyptic number.

129381726 is an abundant number, since it is smaller than the sum of its proper divisors (130131618).

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

129381726 is a wasteful number, since it uses less digits than its factorization.

129381726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62495.

The product of its digits is 36288, while the sum is 39.

The square root of 129381726 is about 11374.6088284389. The cubic root of 129381726 is about 505.7753354887.

The spelling of 129381726 in words is "one hundred twenty-nine million, three hundred eighty-one thousand, seven hundred twenty-six".