18368641 has 2 divisors, whose sum is σ = 18368642. Its totient is φ = 18368640.

The previous prime is 18368639. The next prime is 18368657. The reversal of 18368641 is 14686381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 1795600 = 4071^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 18368641 - 2¹ = 18368639 is a prime.

Together with 18368639, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18368641.

It is not a weakly prime, because it can be changed into another prime (18368671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9184320 + 9184321.

It is an arithmetic number, because the mean of its divisors is an integer number (9184321).

Almost surely, 2^18368641 is an apocalyptic number.

It is an amenable number.

18368641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18368641 is an equidigital number, since it uses as much as digits as its factorization.

18368641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 18368641 is about 4285.8652568647. The cubic root of 18368641 is about 263.8511605543.

The spelling of 18368641 in words is "eighteen million, three hundred sixty-eight thousand, six hundred forty-one".