18566242 has 8 divisors (see below), whose sum is σ = 27870300. Its totient is φ = 9276144.

The previous prime is 18566213. The next prime is 18566263. The reversal of 18566242 is 24266581.

It can be written as a sum of positive squares in 2 ways, for example, as 15358561 + 3207681 = 3919^2 + 1791^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18566198 and 18566207.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 984 + ... + 6172.

Almost surely, 2^18566242 is an apocalyptic number.

18566242 is a deficient number, since it is larger than the sum of its proper divisors (9304058).

18566242 is a wasteful number, since it uses less digits than its factorization.

18566242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6980.

The product of its digits is 23040, while the sum is 34.

The square root of 18566242 is about 4308.8562287456. The cubic root of 18566242 is about 264.7939159587.

The spelling of 18566242 in words is "eighteen million, five hundred sixty-six thousand, two hundred forty-two".