42566979 has 32 divisors (see below), whose sum is σ = 71576064. Its totient is φ = 21899520.

The previous prime is 42566969. The next prime is 42567001. The reversal of 42566979 is 97966524.

It is not a de Polignac number, because 42566979 - 2⁷ = 42566851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42566969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9292 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (2236752).

Almost surely, 2^42566979 is an apocalyptic number.

42566979 is a deficient number, since it is larger than the sum of its proper divisors (29009085).

42566979 is a wasteful number, since it uses less digits than its factorization.

42566979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867.

The product of its digits is 816480, while the sum is 48.

The square root of 42566979 is about 6524.3374376254. The cubic root of 42566979 is about 349.1598324284.

The spelling of 42566979 in words is "forty-two million, five hundred sixty-six thousand, nine hundred seventy-nine".