128955829 has 8 divisors (see below), whose sum is σ = 137796120. Its totient is φ = 120254976.

The previous prime is 128955817. The next prime is 128955847. The reversal of 128955829 is 928559821.

It can be written as a sum of positive squares in 4 ways, for example, as 19272100 + 109683729 = 4390^2 + 10473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128955829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128955859) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32944 + ... + 36649.

It is an arithmetic number, because the mean of its divisors is an integer number (17224515).

Almost surely, 2^128955829 is an apocalyptic number.

It is an amenable number.

128955829 is a deficient number, since it is larger than the sum of its proper divisors (8840291).

128955829 is a wasteful number, since it uses less digits than its factorization.

128955829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69719.

The product of its digits is 518400, while the sum is 49.

The square root of 128955829 is about 11355.8720052667. The cubic root of 128955829 is about 505.2197573115.

The spelling of 128955829 in words is "one hundred twenty-eight million, nine hundred fifty-five thousand, eight hundred twenty-nine".