18232289 has 2 divisors, whose sum is σ = 18232290. Its totient is φ = 18232288.

The previous prime is 18232259. The next prime is 18232327. The reversal of 18232289 is 98223281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 5841889 = 3520^2 + 2417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18232289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18232219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9116144 + 9116145.

It is an arithmetic number, because the mean of its divisors is an integer number (9116145).

Almost surely, 2^18232289 is an apocalyptic number.

It is an amenable number.

18232289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18232289 is an equidigital number, since it uses as much as digits as its factorization.

18232289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 18232289 is about 4269.9284537332. The cubic root of 18232289 is about 263.1966751627.

The spelling of 18232289 in words is "eighteen million, two hundred thirty-two thousand, two hundred eighty-nine".