18418238 has 8 divisors (see below), whose sum is σ = 27646920. Its totient is φ = 9202600.

The previous prime is 18418237. The next prime is 18418243. The reversal of 18418238 is 83281481.

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 = 18418198 and 18418207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418237) 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, 1913 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (3455865).

Almost surely, 2^18418238 is an apocalyptic number.

18418238 is a deficient number, since it is larger than the sum of its proper divisors (9228682).

18418238 is a wasteful number, since it uses less digits than its factorization.

18418238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6522.

The product of its digits is 12288, while the sum is 35.

The square root of 18418238 is about 4291.6474692127. The cubic root of 18418238 is about 264.0884211777.

The spelling of 18418238 in words is "eighteen million, four hundred eighteen thousand, two hundred thirty-eight".