18222660 has 72 divisors (see below), whose sum is σ = 56137536. Its totient is φ = 4783680.

The previous prime is 18222613. The next prime is 18222667. The reversal of 18222660 is 6622281.

It is not an unprimeable number, because it can be changed into a prime (18222667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11305 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (779688).

Almost surely, 2^18222660 is an apocalyptic number.

18222660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18222660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28068768).

18222660 is an abundant number, since it is smaller than the sum of its proper divisors (37914876).

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

18222660 is a wasteful number, since it uses less digits than its factorization.

18222660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18222660 is about 4268.8007683657. The cubic root of 18222660 is about 263.1503330740.

The spelling of 18222660 in words is "eighteen million, two hundred twenty-two thousand, six hundred sixty".