129389556 has 12 divisors (see below), whose sum is σ = 301908992. Its totient is φ = 43129848.

The previous prime is 129389551. The next prime is 129389587. The reversal of 129389556 is 655983921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129389551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5391220 + ... + 5391243.

Almost surely, 2^129389556 is an apocalyptic number.

It is an amenable number.

129389556 is an abundant number, since it is smaller than the sum of its proper divisors (172519436).

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

129389556 is a wasteful number, since it uses less digits than its factorization.

129389556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10782470 (or 10782468 counting only the distinct ones).

The product of its digits is 583200, while the sum is 48.

The square root of 129389556 is about 11374.9530108920. The cubic root of 129389556 is about 505.7855382201.

The spelling of 129389556 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, five hundred fifty-six".