42565881 has 8 divisors (see below), whose sum is σ = 58711680. Its totient is φ = 27398672.

The previous prime is 42565877. The next prime is 42565889. The reversal of 42565881 is 18856524.

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

It is a cyclic number.

It is not a de Polignac number, because 42565881 - 2² = 42565877 is a prime.

It is a super-2 number, since 2×42565881² = 3623708450612322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42565889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244545 + ... + 244718.

It is an arithmetic number, because the mean of its divisors is an integer number (7338960).

Almost surely, 2^42565881 is an apocalyptic number.

It is an amenable number.

42565881 is a deficient number, since it is larger than the sum of its proper divisors (16145799).

42565881 is a wasteful number, since it uses less digits than its factorization.

42565881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489295.

The product of its digits is 76800, while the sum is 39.

The square root of 42565881 is about 6524.2532906073. The cubic root of 42565881 is about 349.1568302516.

The spelling of 42565881 in words is "forty-two million, five hundred sixty-five thousand, eight hundred eighty-one".