18851227 has 2 divisors, whose sum is σ = 18851228. Its totient is φ = 18851226.

The previous prime is 18851221. The next prime is 18851263. The reversal of 18851227 is 72215881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18851227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18851192 and 18851201.

It is not a weakly prime, because it can be changed into another prime (18851221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9425613 + 9425614.

It is an arithmetic number, because the mean of its divisors is an integer number (9425614).

Almost surely, 2^18851227 is an apocalyptic number.

18851227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18851227 is an equidigital number, since it uses as much as digits as its factorization.

18851227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 34.

The square root of 18851227 is about 4341.7999723617. The cubic root of 18851227 is about 266.1418722333.

It can be divided in two parts, 1885122 and 7, that added together give a square (1885129 = 1373²).

The spelling of 18851227 in words is "eighteen million, eight hundred fifty-one thousand, two hundred twenty-seven".