42018609 has 16 divisors (see below), whose sum is σ = 58156544. Its totient is φ = 26956800.

The previous prime is 42018601. The next prime is 42018617. The reversal of 42018609 is 90681024.

It is an interprime number because it is at equal distance from previous prime (42018601) and next prime (42018617).

It is not a de Polignac number, because 42018609 - 2³ = 42018601 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42018601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16779 + ... + 19119.

It is an arithmetic number, because the mean of its divisors is an integer number (3634784).

Almost surely, 2^42018609 is an apocalyptic number.

It is an amenable number.

42018609 is a deficient number, since it is larger than the sum of its proper divisors (16137935).

42018609 is a wasteful number, since it uses less digits than its factorization.

42018609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 42018609 is about 6482.1762549317. The cubic root of 42018609 is about 347.6539945115.

The spelling of 42018609 in words is "forty-two million, eighteen thousand, six hundred nine".