18345289 has 2 divisors, whose sum is σ = 18345290. Its totient is φ = 18345288.

The previous prime is 18345281. The next prime is 18345311. The reversal of 18345289 is 98254381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 4410000 = 3733^2 + 2100^2 .

It is an emirp because it is prime and its reverse (98254381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18345289 - 2³ = 18345281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18345281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172644 + 9172645.

It is an arithmetic number, because the mean of its divisors is an integer number (9172645).

Almost surely, 2^18345289 is an apocalyptic number.

It is an amenable number.

18345289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18345289 is an equidigital number, since it uses as much as digits as its factorization.

18345289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 18345289 is about 4283.1400864319. The cubic root of 18345289 is about 263.7393020675.

The spelling of 18345289 in words is "eighteen million, three hundred forty-five thousand, two hundred eighty-nine".