18221260 has 12 divisors (see below), whose sum is σ = 38264688. Its totient is φ = 7288496.

The previous prime is 18221257. The next prime is 18221339. The reversal of 18221260 is 6212281.

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, 455512 + ... + 455551.

It is an arithmetic number, because the mean of its divisors is an integer number (3188724).

Almost surely, 2^18221260 is an apocalyptic number.

18221260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18221260 is an abundant number, since it is smaller than the sum of its proper divisors (20043428).

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

18221260 is a wasteful number, since it uses less digits than its factorization.

18221260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911072 (or 911070 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18221260 is about 4268.6367847358. The cubic root of 18221260 is about 263.1435938474.

It can be divided in two parts, 18221 and 260, that added together give a palindrome (18481).

The spelling of 18221260 in words is "eighteen million, two hundred twenty-one thousand, two hundred sixty".