18503226 has 96 divisors (see below), whose sum is σ = 49420800. Its totient is φ = 4885920.

The previous prime is 18503209. The next prime is 18503227. The reversal of 18503226 is 62230581.

It is a self number, because there is not a number n which added to its sum of digits gives 18503226.

It is not an unprimeable number, because it can be changed into a prime (18503227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141181 + ... + 141311.

It is an arithmetic number, because the mean of its divisors is an integer number (514800).

Almost surely, 2^18503226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18503226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24710400).

18503226 is an abundant number, since it is smaller than the sum of its proper divisors (30917574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18503226 is a wasteful number, since it uses less digits than its factorization.

18503226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 18503226 is about 4301.5376320567. The cubic root of 18503226 is about 264.4939958591.

The spelling of 18503226 in words is "eighteen million, five hundred three thousand, two hundred twenty-six".