18018073 has 2 divisors, whose sum is σ = 18018074. Its totient is φ = 18018072.

The previous prime is 18018067. The next prime is 18018107. The reversal of 18018073 is 37081081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17867529 + 150544 = 4227^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018073 - 2¹³ = 18009881 is a prime.

It is not a weakly prime, because it can be changed into another prime (18018043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009036 + 9009037.

It is an arithmetic number, because the mean of its divisors is an integer number (9009037).

Almost surely, 2^18018073 is an apocalyptic number.

It is an amenable number.

18018073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018073 is an equidigital number, since it uses as much as digits as its factorization.

18018073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18018073 is about 4244.7700762232. The cubic root of 18018073 is about 262.1618224131.

The spelling of 18018073 in words is "eighteen million, eighteen thousand, seventy-three".