18618238 has 4 divisors (see below), whose sum is σ = 27927360. Its totient is φ = 9309118.

The previous prime is 18618227. The next prime is 18618253. The reversal of 18618238 is 83281681.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18618197 and 18618206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4654558 + ... + 4654561.

It is an arithmetic number, because the mean of its divisors is an integer number (6981840).

Almost surely, 2^18618238 is an apocalyptic number.

18618238 is a deficient number, since it is larger than the sum of its proper divisors (9309122).

18618238 is an equidigital number, since it uses as much as digits as its factorization.

18618238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309121.

The product of its digits is 18432, while the sum is 37.

The square root of 18618238 is about 4314.8856300023. The cubic root of 18618238 is about 265.0408765709.

The spelling of 18618238 in words is "eighteen million, six hundred eighteen thousand, two hundred thirty-eight".