42643879 has 4 divisors (see below), whose sum is σ = 44019520. Its totient is φ = 41268240.

The previous prime is 42643859. The next prime is 42643889. The reversal of 42643879 is 97834624.

42643879 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 cyclic number.

It is not a de Polignac number, because 42643879 - 2¹³ = 42635687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42643829) 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 3 ways as a sum of consecutive naturals, for example, 687774 + ... + 687835.

It is an arithmetic number, because the mean of its divisors is an integer number (11004880).

Almost surely, 2^42643879 is an apocalyptic number.

42643879 is a deficient number, since it is larger than the sum of its proper divisors (1375641).

42643879 is a wasteful number, since it uses less digits than its factorization.

42643879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375640.

The product of its digits is 290304, while the sum is 43.

The square root of 42643879 is about 6530.2280970882. The cubic root of 42643879 is about 349.3699658774.

The spelling of 42643879 in words is "forty-two million, six hundred forty-three thousand, eight hundred seventy-nine".