18257222 has 8 divisors (see below), whose sum is σ = 27404136. Its totient is φ = 9122512.

The previous prime is 18257207. The next prime is 18257249. The reversal of 18257222 is 22275281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×18257222⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3533 + ... + 6999.

It is an arithmetic number, because the mean of its divisors is an integer number (3425517).

Almost surely, 2^18257222 is an apocalyptic number.

18257222 is a deficient number, since it is larger than the sum of its proper divisors (9146914).

18257222 is a wasteful number, since it uses less digits than its factorization.

18257222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6102.

The product of its digits is 4480, while the sum is 29.

The square root of 18257222 is about 4272.8470602164. The cubic root of 18257222 is about 263.3165959915.

The spelling of 18257222 in words is "eighteen million, two hundred fifty-seven thousand, two hundred twenty-two".