18259489 has 2 divisors, whose sum is σ = 18259490. Its totient is φ = 18259488.

The previous prime is 18259459. The next prime is 18259529. The reversal of 18259489 is 98495281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 3359889 = 3860^2 + 1833^2 .

It is a cyclic number.

It is not a de Polignac number, because 18259489 - 2¹¹ = 18257441 is a prime.

It is a super-2 number, since 2×18259489² = 666817877082242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18259429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9129744 + 9129745.

It is an arithmetic number, because the mean of its divisors is an integer number (9129745).

Almost surely, 2^18259489 is an apocalyptic number.

It is an amenable number.

18259489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18259489 is an equidigital number, since it uses as much as digits as its factorization.

18259489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 18259489 is about 4273.1123317788. The cubic root of 18259489 is about 263.3274942179.

The spelling of 18259489 in words is "eighteen million, two hundred fifty-nine thousand, four hundred eighty-nine".