18881227 has 2 divisors, whose sum is σ = 18881228. Its totient is φ = 18881226.

The previous prime is 18881221. The next prime is 18881267. The reversal of 18881227 is 72218881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18881227 - 2¹⁹ = 18356939 is a prime.

It is not a weakly prime, because it can be changed into another prime (18881221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440613 + 9440614.

It is an arithmetic number, because the mean of its divisors is an integer number (9440614).

Almost surely, 2^18881227 is an apocalyptic number.

18881227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18881227 is an equidigital number, since it uses as much as digits as its factorization.

18881227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 37.

The square root of 18881227 is about 4345.2533873182. The cubic root of 18881227 is about 266.2829775400.

The spelling of 18881227 in words is "eighteen million, eight hundred eighty-one thousand, two hundred twenty-seven".