18438268 has 24 divisors (see below), whose sum is σ = 34301232. Its totient is φ = 8642304.

The previous prime is 18438263. The next prime is 18438283. The reversal of 18438268 is 86283481.

It is a self number, because there is not a number n which added to its sum of digits gives 18438268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26655 + ... + 27337.

It is an arithmetic number, because the mean of its divisors is an integer number (1429218).

Almost surely, 2^18438268 is an apocalyptic number.

It is an amenable number.

18438268 is a deficient number, since it is larger than the sum of its proper divisors (15862964).

18438268 is a wasteful number, since it uses less digits than its factorization.

18438268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1099 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 18438268 is about 4293.9804377757. The cubic root of 18438268 is about 264.1841193422.

The spelling of 18438268 in words is "eighteen million, four hundred thirty-eight thousand, two hundred sixty-eight".