42128945 has 8 divisors (see below), whose sum is σ = 50941440. Its totient is φ = 33445360.

The previous prime is 42128929. The next prime is 42128971. The reversal of 42128945 is 54982124.

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

It is not a de Polignac number, because 42128945 - 2⁴ = 42128929 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31505 + ... + 32814.

It is an arithmetic number, because the mean of its divisors is an integer number (6367680).

Almost surely, 2^42128945 is an apocalyptic number.

It is an amenable number.

42128945 is a deficient number, since it is larger than the sum of its proper divisors (8812495).

42128945 is a wasteful number, since it uses less digits than its factorization.

42128945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64455.

The product of its digits is 23040, while the sum is 35.

The square root of 42128945 is about 6490.6813972032. The cubic root of 42128945 is about 347.9580282538.

The spelling of 42128945 in words is "forty-two million, one hundred twenty-eight thousand, nine hundred forty-five".