42138544 has 20 divisors (see below), whose sum is σ = 93307024. Its totient is φ = 18059328.

The previous prime is 42138539. The next prime is 42138557. The reversal of 42138544 is 44583124.

42138544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 3 ways as a sum of consecutive naturals, for example, 188007 + ... + 188230.

Almost surely, 2^42138544 is an apocalyptic number.

It is an amenable number.

42138544 is an abundant number, since it is smaller than the sum of its proper divisors (51168480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42138544 is a wasteful number, since it uses less digits than its factorization.

42138544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376252 (or 376246 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 42138544 is about 6491.4207997941. The cubic root of 42138544 is about 347.9844534386.

The spelling of 42138544 in words is "forty-two million, one hundred thirty-eight thousand, five hundred forty-four".