18042289 has 2 divisors, whose sum is σ = 18042290. Its totient is φ = 18042288.

The previous prime is 18042251. The next prime is 18042293. The reversal of 18042289 is 98224081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9090225 + 8952064 = 3015^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 18042289 - 2⁷ = 18042161 is a prime.

It is not a weakly prime, because it can be changed into another prime (18042239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021144 + 9021145.

It is an arithmetic number, because the mean of its divisors is an integer number (9021145).

Almost surely, 2^18042289 is an apocalyptic number.

It is an amenable number.

18042289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18042289 is an equidigital number, since it uses as much as digits as its factorization.

18042289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18042289 is about 4247.6215697729. The cubic root of 18042289 is about 262.2792169261.

The spelling of 18042289 in words is "eighteen million, forty-two thousand, two hundred eighty-nine".