42128857 has 8 divisors (see below), whose sum is σ = 42943680. Its totient is φ = 41318160.

The previous prime is 42128831. The next prime is 42128869. The reversal of 42128857 is 75882124.

42128857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42128857 - 2²³ = 33740249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42128887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26244 + ... + 27802.

It is an arithmetic number, because the mean of its divisors is an integer number (5367960).

Almost surely, 2^42128857 is an apocalyptic number.

It is an amenable number.

42128857 is a deficient number, since it is larger than the sum of its proper divisors (814823).

42128857 is a wasteful number, since it uses less digits than its factorization.

42128857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063.

The product of its digits is 35840, while the sum is 37.

The square root of 42128857 is about 6490.6746182504. The cubic root of 42128857 is about 347.9577859791.

The spelling of 42128857 in words is "forty-two million, one hundred twenty-eight thousand, eight hundred fifty-seven".