18812227 has 6 divisors (see below), whose sum is σ = 21883668. Its totient is φ = 16124724.

The previous prime is 18812221. The next prime is 18812237. The reversal of 18812227 is 72221881.

It is not a de Polignac number, because 18812227 - 2¹¹ = 18810179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18812221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191913 + ... + 192010.

It is an arithmetic number, because the mean of its divisors is an integer number (3647278).

Almost surely, 2^18812227 is an apocalyptic number.

18812227 is a deficient number, since it is larger than the sum of its proper divisors (3071441).

18812227 is an equidigital number, since it uses as much as digits as its factorization.

18812227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383937 (or 383930 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 18812227 is about 4337.3064221934. The cubic root of 18812227 is about 265.9582113485.

The spelling of 18812227 in words is "eighteen million, eight hundred twelve thousand, two hundred twenty-seven".