18071227 has 4 divisors (see below), whose sum is σ = 18191056. Its totient is φ = 17951400.

The previous prime is 18071177. The next prime is 18071257. The reversal of 18071227 is 72217081.

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 18071227 - 2¹⁹ = 17546939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18071195 and 18071204.

It is not an unprimeable number, because it can be changed into a prime (18071257) 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, 59688 + ... + 59989.

It is an arithmetic number, because the mean of its divisors is an integer number (4547764).

Almost surely, 2^18071227 is an apocalyptic number.

18071227 is a deficient number, since it is larger than the sum of its proper divisors (119829).

18071227 is a wasteful number, since it uses less digits than its factorization.

18071227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119828.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 18071227 is about 4251.0265818976. The cubic root of 18071227 is about 262.4193651046.

The spelling of 18071227 in words is "eighteen million, seventy-one thousand, two hundred twenty-seven".