42018865 has 32 divisors (see below), whose sum is σ = 60148224. Its totient is φ = 27578880.

The previous prime is 42018863. The next prime is 42018881. The reversal of 42018865 is 56881024.

It is not a de Polignac number, because 42018865 - 2¹ = 42018863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42018865.

It is not an unprimeable number, because it can be changed into a prime (42018863) 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, 91717 + ... + 92173.

It is an arithmetic number, because the mean of its divisors is an integer number (1879632).

Almost surely, 2^42018865 is an apocalyptic number.

It is an amenable number.

42018865 is a deficient number, since it is larger than the sum of its proper divisors (18129359).

42018865 is a wasteful number, since it uses less digits than its factorization.

42018865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 42018865 is about 6482.1960013563. The cubic root of 42018865 is about 347.6547005418.

Adding to 42018865 its reverse (56881024), we get a palindrome (98899889).

The spelling of 42018865 in words is "forty-two million, eighteen thousand, eight hundred sixty-five".