18036841 has 2 divisors, whose sum is σ = 18036842. Its totient is φ = 18036840.

The previous prime is 18036839. The next prime is 18036857. The reversal of 18036841 is 14863081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 6780816 = 3355^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 18036841 - 2¹ = 18036839 is a prime.

Together with 18036839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18036341) 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, 9018420 + 9018421.

It is an arithmetic number, because the mean of its divisors is an integer number (9018421).

Almost surely, 2^18036841 is an apocalyptic number.

It is an amenable number.

18036841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18036841 is an equidigital number, since it uses as much as digits as its factorization.

18036841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18036841 is about 4246.9802212866. The cubic root of 18036841 is about 262.2528152314.

The spelling of 18036841 in words is "eighteen million, thirty-six thousand, eight hundred forty-one".