42228638 has 4 divisors (see below), whose sum is σ = 63342960. Its totient is φ = 21114318.

The previous prime is 42228587. The next prime is 42228679. The reversal of 42228638 is 83682224.

42228638 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 junction number, because it is equal to n+sod(n) for n = 42228598 and 42228607.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10557158 + ... + 10557161.

It is an arithmetic number, because the mean of its divisors is an integer number (15835740).

Almost surely, 2^42228638 is an apocalyptic number.

42228638 is a deficient number, since it is larger than the sum of its proper divisors (21114322).

42228638 is a wasteful number, since it uses less digits than its factorization.

42228638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21114321.

The product of its digits is 36864, while the sum is 35.

The square root of 42228638 is about 6498.3565614700. The cubic root of 42228638 is about 348.2322787579.

The spelling of 42228638 in words is "forty-two million, two hundred twenty-eight thousand, six hundred thirty-eight".