18357227 has 4 divisors (see below), whose sum is σ = 20979696. Its totient is φ = 15734760.

The previous prime is 18357191. The next prime is 18357257. The reversal of 18357227 is 72275381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72275381 = 17 ⋅4251493.

It is a cyclic number.

It is not a de Polignac number, because 18357227 - 2¹⁸ = 18095083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18357257) 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 3 ways as a sum of consecutive naturals, for example, 1311224 + ... + 1311237.

It is an arithmetic number, because the mean of its divisors is an integer number (5244924).

Almost surely, 2^18357227 is an apocalyptic number.

18357227 is a deficient number, since it is larger than the sum of its proper divisors (2622469).

18357227 is an equidigital number, since it uses as much as digits as its factorization.

18357227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622468.

The product of its digits is 23520, while the sum is 35.

The square root of 18357227 is about 4284.5334635174. The cubic root of 18357227 is about 263.7964981698.

The spelling of 18357227 in words is "eighteen million, three hundred fifty-seven thousand, two hundred twenty-seven".