18486227 has 4 divisors (see below), whose sum is σ = 19290000. Its totient is φ = 17682456.

The previous prime is 18486197. The next prime is 18486263. The reversal of 18486227 is 72268481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72268481 = 2293 ⋅31517.

It is a cyclic number.

It is not a de Polignac number, because 18486227 - 2¹⁶ = 18420691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18486277) 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, 401852 + ... + 401897.

It is an arithmetic number, because the mean of its divisors is an integer number (4822500).

Almost surely, 2^18486227 is an apocalyptic number.

18486227 is a deficient number, since it is larger than the sum of its proper divisors (803773).

18486227 is an equidigital number, since it uses as much as digits as its factorization.

18486227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803772.

The product of its digits is 43008, while the sum is 38.

The square root of 18486227 is about 4299.5612566865. The cubic root of 18486227 is about 264.4129737531.

The spelling of 18486227 in words is "eighteen million, four hundred eighty-six thousand, two hundred twenty-seven".