18191226 has 16 divisors (see below), whose sum is σ = 36670464. Its totient is φ = 6015744.

The previous prime is 18191221. The next prime is 18191263. The reversal of 18191226 is 62219181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18191193 and 18191202.

It is not an unprimeable number, because it can be changed into a prime (18191221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11175 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (2291904).

Almost surely, 2^18191226 is an apocalyptic number.

18191226 is an abundant number, since it is smaller than the sum of its proper divisors (18479238).

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

18191226 is a wasteful number, since it uses less digits than its factorization.

18191226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24005.

The product of its digits is 1728, while the sum is 30.

The square root of 18191226 is about 4265.1173489132. The cubic root of 18191226 is about 262.9989349714.

The spelling of 18191226 in words is "eighteen million, one hundred ninety-one thousand, two hundred twenty-six".