18072289 has 2 divisors, whose sum is σ = 18072290. Its totient is φ = 18072288.

The previous prime is 18072281. The next prime is 18072293. The reversal of 18072289 is 98227081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 3211264 = 3855^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 18072289 - 2³ = 18072281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18072281) 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, 9036144 + 9036145.

It is an arithmetic number, because the mean of its divisors is an integer number (9036145).

Almost surely, 2^18072289 is an apocalyptic number.

It is an amenable number.

18072289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18072289 is an equidigital number, since it uses as much as digits as its factorization.

18072289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18072289 is about 4251.1514910669. The cubic root of 18072289 is about 262.4245055765.

It can be divided in two parts, 1807 and 2289, that added together give a 12-th power (4096 = 2¹²).

The spelling of 18072289 in words is "eighteen million, seventy-two thousand, two hundred eighty-nine".