129043656 has 144 divisors (see below), whose sum is σ = 412588800. Its totient is φ = 36324288.

The previous prime is 129043643. The next prime is 129043667. The reversal of 129043656 is 656340921.

It is a happy number.

129043656 is a `hidden beast` number, since 1 + 290 + 4 + 365 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 129043656.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 278481 + ... + 278943.

It is an arithmetic number, because the mean of its divisors is an integer number (2865200).

Almost surely, 2^129043656 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 129043656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206294400).

129043656 is an abundant number, since it is smaller than the sum of its proper divisors (283545144).

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

129043656 is a wasteful number, since it uses less digits than its factorization.

129043656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 129043656 is about 11359.7383772691. The cubic root of 129043656 is about 505.3344267204.

The spelling of 129043656 in words is "one hundred twenty-nine million, forty-three thousand, six hundred fifty-six".