18206227 has 4 divisors (see below), whose sum is σ = 19606720. Its totient is φ = 16805736.

The previous prime is 18206219. The next prime is 18206233. The reversal of 18206227 is 72260281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18206227 - 2³ = 18206219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18206195 and 18206204.

It is not an unprimeable number, because it can be changed into a prime (18206267) 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, 700227 + ... + 700252.

It is an arithmetic number, because the mean of its divisors is an integer number (4901680).

Almost surely, 2^18206227 is an apocalyptic number.

18206227 is a deficient number, since it is larger than the sum of its proper divisors (1400493).

18206227 is a wasteful number, since it uses less digits than its factorization.

18206227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400492.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18206227 is about 4266.8755547824. The cubic root of 18206227 is about 263.0712072317.

The spelling of 18206227 in words is "eighteen million, two hundred six thousand, two hundred twenty-seven".