42644139 has 8 divisors (see below), whose sum is σ = 59331072. Its totient is φ = 27193320.

The previous prime is 42644137. The next prime is 42644153. The reversal of 42644139 is 93144624.

42644139 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 not a de Polignac number, because 42644139 - 2¹ = 42644137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42644137) 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, 308947 + ... + 309084.

It is an arithmetic number, because the mean of its divisors is an integer number (7416384).

Almost surely, 2^42644139 is an apocalyptic number.

42644139 is a deficient number, since it is larger than the sum of its proper divisors (16686933).

42644139 is a wasteful number, since it uses less digits than its factorization.

42644139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618057.

The product of its digits is 20736, while the sum is 33.

The square root of 42644139 is about 6530.2480044788. The cubic root of 42644139 is about 349.3706759129.

The spelling of 42644139 in words is "forty-two million, six hundred forty-four thousand, one hundred thirty-nine".