18486289 has 2 divisors, whose sum is σ = 18486290. Its totient is φ = 18486288.

The previous prime is 18486287. The next prime is 18486329. The reversal of 18486289 is 98268481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 65025 = 4292^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 18486289 - 2¹ = 18486287 is a prime.

Together with 18486287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18486287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243144 + 9243145.

It is an arithmetic number, because the mean of its divisors is an integer number (9243145).

Almost surely, 2^18486289 is an apocalyptic number.

It is an amenable number.

18486289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18486289 is an equidigital number, since it uses as much as digits as its factorization.

18486289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 46.

The square root of 18486289 is about 4299.5684667185. The cubic root of 18486289 is about 264.4132693531.

The spelling of 18486289 in words is "eighteen million, four hundred eighty-six thousand, two hundred eighty-nine".