18242242 has 8 divisors (see below), whose sum is σ = 28803600. Its totient is φ = 8641044.

The previous prime is 18242209. The next prime is 18242249. The reversal of 18242242 is 24224281.

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

It is a super-4 number, since 4×18242242⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (18242249) 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 3 ways as a sum of consecutive naturals, for example, 239992 + ... + 240067.

It is an arithmetic number, because the mean of its divisors is an integer number (3600450).

Almost surely, 2^18242242 is an apocalyptic number.

18242242 is a deficient number, since it is larger than the sum of its proper divisors (10561358).

18242242 is a wasteful number, since it uses less digits than its factorization.

18242242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480080.

The product of its digits is 2048, while the sum is 25.

The square root of 18242242 is about 4271.0937709210. The cubic root of 18242242 is about 263.2445594405.

It can be divided in two parts, 182 and 42242, that added together give a palindrome (42424).

The spelling of 18242242 in words is "eighteen million, two hundred forty-two thousand, two hundred forty-two".