129497756 has 12 divisors (see below), whose sum is σ = 228865560. Its totient is φ = 64107600.

The previous prime is 129497747. The next prime is 129497773. The reversal of 129497756 is 657794921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159866 + ... + 160673.

It is an arithmetic number, because the mean of its divisors is an integer number (19072130).

Almost surely, 2^129497756 is an apocalyptic number.

It is an amenable number.

129497756 is a deficient number, since it is larger than the sum of its proper divisors (99367804).

129497756 is a wasteful number, since it uses less digits than its factorization.

129497756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320644 (or 320642 counting only the distinct ones).

The product of its digits is 952560, while the sum is 50.

The square root of 129497756 is about 11379.7080806144. The cubic root of 129497756 is about 505.9264840312.

The spelling of 129497756 in words is "one hundred twenty-nine million, four hundred ninety-seven thousand, seven hundred fifty-six".