42128999 has 8 divisors (see below), whose sum is σ = 46366992. Its totient is φ = 37959040.

The previous prime is 42128987. The next prime is 42129001. The reversal of 42128999 is 99982124.

42128999 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 42128999 - 2⁸ = 42128743 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 (42128929) 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, 15704 + ... + 18189.

It is an arithmetic number, because the mean of its divisors is an integer number (5795874).

Almost surely, 2^42128999 is an apocalyptic number.

42128999 is a deficient number, since it is larger than the sum of its proper divisors (4237993).

42128999 is a wasteful number, since it uses less digits than its factorization.

42128999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34017.

The product of its digits is 93312, while the sum is 44.

The square root of 42128999 is about 6490.6855570117. The cubic root of 42128999 is about 347.9581769221.

The spelling of 42128999 in words is "forty-two million, one hundred twenty-eight thousand, nine hundred ninety-nine".