18418793 has 2 divisors, whose sum is σ = 18418794. Its totient is φ = 18418792.

The previous prime is 18418787. The next prime is 18418819. The reversal of 18418793 is 39781481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9909904 + 8508889 = 3148^2 + 2917^2 .

It is an emirp because it is prime and its reverse (39781481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18418793 - 2⁸ = 18418537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18418793.

It is not a weakly prime, because it can be changed into another prime (18418723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209396 + 9209397.

It is an arithmetic number, because the mean of its divisors is an integer number (9209397).

Almost surely, 2^18418793 is an apocalyptic number.

It is an amenable number.

18418793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418793 is an equidigital number, since it uses as much as digits as its factorization.

18418793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18418793 is about 4291.7121292090. The cubic root of 18418793 is about 264.0910737587.

The spelling of 18418793 in words is "eighteen million, four hundred eighteen thousand, seven hundred ninety-three".