18144338 has 16 divisors (see below), whose sum is σ = 29364120. Its totient is φ = 8376576.

The previous prime is 18144317. The next prime is 18144353. The reversal of 18144338 is 83344181.

It can be written as a sum of positive squares in 4 ways, for example, as 16949689 + 1194649 = 4117^2 + 1093^2 .

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 3233 + ... + 6836.

Almost surely, 2^18144338 is an apocalyptic number.

18144338 is a deficient number, since it is larger than the sum of its proper divisors (11219782).

18144338 is a wasteful number, since it uses less digits than its factorization.

18144338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10141.

The product of its digits is 9216, while the sum is 32.

The square root of 18144338 is about 4259.6171189439. The cubic root of 18144338 is about 262.7727800823.

The spelling of 18144338 in words is "eighteen million, one hundred forty-four thousand, three hundred thirty-eight".