18463189 has 2 divisors, whose sum is σ = 18463190. Its totient is φ = 18463188.

The previous prime is 18463187. The next prime is 18463213. The reversal of 18463189 is 98136481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 400689 = 4250^2 + 633^2 .

It is an emirp because it is prime and its reverse (98136481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18463189 - 2¹ = 18463187 is a prime.

Together with 18463187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18463187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9231594 + 9231595.

It is an arithmetic number, because the mean of its divisors is an integer number (9231595).

Almost surely, 2^18463189 is an apocalyptic number.

It is an amenable number.

18463189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18463189 is an equidigital number, since it uses as much as digits as its factorization.

18463189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 18463189 is about 4296.8813109045. The cubic root of 18463189 is about 264.3030887322.

The spelling of 18463189 in words is "eighteen million, four hundred sixty-three thousand, one hundred eighty-nine".