18257226 has 16 divisors (see below), whose sum is σ = 39323424. Its totient is φ = 5617584.

The previous prime is 18257207. The next prime is 18257249. The reversal of 18257226 is 62275281.

It is a super-4 number, since 4×18257226⁴ (a number of 30 digits) contains 4444 as substring.

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 7 ways as a sum of consecutive naturals, for example, 116956 + ... + 117111.

It is an arithmetic number, because the mean of its divisors is an integer number (2457714).

Almost surely, 2^18257226 is an apocalyptic number.

18257226 is an abundant number, since it is smaller than the sum of its proper divisors (21066198).

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

18257226 is a wasteful number, since it uses less digits than its factorization.

18257226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234085.

The product of its digits is 13440, while the sum is 33.

The square root of 18257226 is about 4272.8475282884. The cubic root of 18257226 is about 263.3166152217.

The spelling of 18257226 in words is "eighteen million, two hundred fifty-seven thousand, two hundred twenty-six".