18871227 has 12 divisors (see below), whose sum is σ = 27297504. Its totient is φ = 12562800.

The previous prime is 18871217. The next prime is 18871231. The reversal of 18871227 is 72217881.

It is a happy number.

It is not a de Polignac number, because 18871227 - 2⁴ = 18871211 is a prime.

It is a super-2 number, since 2×18871227² = 712246416971058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18871191 and 18871200.

It is not an unprimeable number, because it can be changed into a prime (18871217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8977 + ... + 10877.

It is an arithmetic number, because the mean of its divisors is an integer number (2274792).

Almost surely, 2^18871227 is an apocalyptic number.

18871227 is a deficient number, since it is larger than the sum of its proper divisors (8426277).

18871227 is a wasteful number, since it uses less digits than its factorization.

18871227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010 (or 3007 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 18871227 is about 4344.1025540381. The cubic root of 18871227 is about 266.2359590559.

The spelling of 18871227 in words is "eighteen million, eight hundred seventy-one thousand, two hundred twenty-seven".