18227173 has 4 divisors (see below), whose sum is σ = 18415180. Its totient is φ = 18039168.

The previous prime is 18227159. The next prime is 18227197. The reversal of 18227173 is 37172281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37172281 = 41 ⋅906641.

It can be written as a sum of positive squares in 2 ways, for example, as 2490084 + 15737089 = 1578^2 + 3967^2 .

It is a cyclic number.

It is not a de Polignac number, because 18227173 - 2⁹ = 18226661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93858 + ... + 94051.

It is an arithmetic number, because the mean of its divisors is an integer number (4603795).

Almost surely, 2^18227173 is an apocalyptic number.

It is an amenable number.

18227173 is a deficient number, since it is larger than the sum of its proper divisors (188007).

18227173 is an equidigital number, since it uses as much as digits as its factorization.

18227173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188006.

The product of its digits is 4704, while the sum is 31.

The square root of 18227173 is about 4269.3293384324. The cubic root of 18227173 is about 263.1720551026.

The spelling of 18227173 in words is "eighteen million, two hundred twenty-seven thousand, one hundred seventy-three".