18212226 has 8 divisors (see below), whose sum is σ = 36424464. Its totient is φ = 6070740.

The previous prime is 18212213. The next prime is 18212237. The reversal of 18212226 is 62221281.

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

18212226 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18212196 and 18212205.

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, 1517680 + ... + 1517691.

It is an arithmetic number, because the mean of its divisors is an integer number (4553058).

Almost surely, 2^18212226 is an apocalyptic number.

18212226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18212226 is a wasteful number, since it uses less digits than its factorization.

18212226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035376.

The product of its digits is 768, while the sum is 24.

The square root of 18212226 is about 4267.5784702803. The cubic root of 18212226 is about 263.1000982785.

The spelling of 18212226 in words is "eighteen million, two hundred twelve thousand, two hundred twenty-six".