18228487 has 2 divisors, whose sum is σ = 18228488. Its totient is φ = 18228486.

The previous prime is 18228461. The next prime is 18228493. The reversal of 18228487 is 78482281.

It is a strong prime.

It is an emirp because it is prime and its reverse (78482281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18228487 - 2¹⁵ = 18195719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18268487) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114243 + 9114244.

It is an arithmetic number, because the mean of its divisors is an integer number (9114244).

Almost surely, 2^18228487 is an apocalyptic number.

18228487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228487 is an equidigital number, since it uses as much as digits as its factorization.

18228487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 40.

The square root of 18228487 is about 4269.4832239980. The cubic root of 18228487 is about 263.1783789900.

The spelling of 18228487 in words is "eighteen million, two hundred twenty-eight thousand, four hundred eighty-seven".