129126784 has 48 divisors (see below), whose sum is σ = 269056620. Its totient is φ = 61723904.

The previous prime is 129126779. The next prime is 129126787. The reversal of 129126784 is 487621921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129126787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66759 + ... + 68665.

Almost surely, 2^129126784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129126784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134528310).

129126784 is an abundant number, since it is smaller than the sum of its proper divisors (139929836).

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

129126784 is an equidigital number, since it uses as much as digits as its factorization.

129126784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967 (or 1932 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 129126784 is about 11363.3966752904. The cubic root of 129126784 is about 505.4429130642.

The spelling of 129126784 in words is "one hundred twenty-nine million, one hundred twenty-six thousand, seven hundred eighty-four".