18309222 has 12 divisors (see below), whose sum is σ = 39670020. Its totient is φ = 6103068.

The previous prime is 18309199. The next prime is 18309223. The reversal of 18309222 is 22290381.

It is a happy number.

It is a super-2 number, since 2×18309222² = 670455220490568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18309223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 508572 + ... + 508607.

It is an arithmetic number, because the mean of its divisors is an integer number (3305835).

Almost surely, 2^18309222 is an apocalyptic number.

18309222 is an abundant number, since it is smaller than the sum of its proper divisors (21360798).

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

18309222 is a wasteful number, since it uses less digits than its factorization.

18309222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017187 (or 1017184 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18309222 is about 4278.9276694050. The cubic root of 18309222 is about 263.5663507452.

The spelling of 18309222 in words is "eighteen million, three hundred nine thousand, two hundred twenty-two".