18289438 has 8 divisors (see below), whose sum is σ = 28878120. Its totient is φ = 8663400.

The previous prime is 18289429. The next prime is 18289451. The reversal of 18289438 is 83498281.

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 = 18289394 and 18289403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240613 + ... + 240688.

It is an arithmetic number, because the mean of its divisors is an integer number (3609765).

Almost surely, 2^18289438 is an apocalyptic number.

18289438 is a deficient number, since it is larger than the sum of its proper divisors (10588682).

18289438 is a wasteful number, since it uses less digits than its factorization.

18289438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481322.

The product of its digits is 110592, while the sum is 43.

The square root of 18289438 is about 4276.6152504054. The cubic root of 18289438 is about 263.4713844682.

The spelling of 18289438 in words is "eighteen million, two hundred eighty-nine thousand, four hundred thirty-eight".