18238838 has 4 divisors (see below), whose sum is σ = 27358260. Its totient is φ = 9119418.

The previous prime is 18238811. The next prime is 18238849. The reversal of 18238838 is 83883281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83883281 = 5519 ⋅15199.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18238795 and 18238804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4559708 + ... + 4559711.

It is an arithmetic number, because the mean of its divisors is an integer number (6839565).

Almost surely, 2^18238838 is an apocalyptic number.

18238838 is a deficient number, since it is larger than the sum of its proper divisors (9119422).

18238838 is an equidigital number, since it uses as much as digits as its factorization.

18238838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119421.

The product of its digits is 73728, while the sum is 41.

The square root of 18238838 is about 4270.6952595567. The cubic root of 18238838 is about 263.2281846217.

The spelling of 18238838 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred thirty-eight".