42844138 has 8 divisors (see below), whose sum is σ = 65146788. Its totient is φ = 21128544.

The previous prime is 42844133. The next prime is 42844141. The reversal of 42844138 is 83144824.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38975049 + 3869089 = 6243^2 + 1967^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42844133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146581 + ... + 146872.

Almost surely, 2^42844138 is an apocalyptic number.

42844138 is a deficient number, since it is larger than the sum of its proper divisors (22302650).

42844138 is a wasteful number, since it uses less digits than its factorization.

42844138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293528.

The product of its digits is 24576, while the sum is 34.

The square root of 42844138 is about 6545.5433693468. The cubic root of 42844138 is about 349.9160016111.

The spelling of 42844138 in words is "forty-two million, eight hundred forty-four thousand, one hundred thirty-eight".