18660222 has 96 divisors (see below), whose sum is σ = 49600512. Its totient is φ = 4954752.

The previous prime is 18660221. The next prime is 18660227. The reversal of 18660222 is 22206681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18660221) 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, 136138 + ... + 136274.

It is an arithmetic number, because the mean of its divisors is an integer number (516672).

Almost surely, 2^18660222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18660222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24800256).

18660222 is an abundant number, since it is smaller than the sum of its proper divisors (30940290).

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

18660222 is a wasteful number, since it uses less digits than its factorization.

18660222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 219 counting only the distinct ones).

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

The square root of 18660222 is about 4319.7479093114. The cubic root of 18660222 is about 265.2399488013.

It can be divided in two parts, 186602 and 22, that added together give a square (186624 = 432²).

The spelling of 18660222 in words is "eighteen million, six hundred sixty thousand, two hundred twenty-two".