42128047 has 4 divisors (see below), whose sum is σ = 45368680. Its totient is φ = 38887416.

The previous prime is 42128041. The next prime is 42128069. The reversal of 42128047 is 74082124.

42128047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42128047 - 2⁷ = 42127919 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 (42128041) 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 3 ways as a sum of consecutive naturals, for example, 1620297 + ... + 1620322.

It is an arithmetic number, because the mean of its divisors is an integer number (11342170).

Almost surely, 2^42128047 is an apocalyptic number.

42128047 is a deficient number, since it is larger than the sum of its proper divisors (3240633).

42128047 is a wasteful number, since it uses less digits than its factorization.

42128047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240632.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 42128047 is about 6490.6122207385. The cubic root of 42128047 is about 347.9555559351.

The spelling of 42128047 in words is "forty-two million, one hundred twenty-eight thousand, forty-seven".