42579643 has 4 divisors (see below), whose sum is σ = 42956568. Its totient is φ = 42202720.

The previous prime is 42579629. The next prime is 42579661. The reversal of 42579643 is 34697524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42579643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42579596 and 42579605.

It is not an unprimeable number, because it can be changed into a prime (42579673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188293 + ... + 188518.

It is an arithmetic number, because the mean of its divisors is an integer number (10739142).

Almost surely, 2^42579643 is an apocalyptic number.

42579643 is a deficient number, since it is larger than the sum of its proper divisors (376925).

42579643 is a wasteful number, since it uses less digits than its factorization.

42579643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376924.

The product of its digits is 181440, while the sum is 40.

The square root of 42579643 is about 6525.3078854564. The cubic root of 42579643 is about 349.1944548970.

The spelling of 42579643 in words is "forty-two million, five hundred seventy-nine thousand, six hundred forty-three".