18382817 has 2 divisors, whose sum is σ = 18382818. Its totient is φ = 18382816.

The previous prime is 18382813. The next prime is 18382829. The reversal of 18382817 is 71828381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 141376 = 4271^2 + 376^2 .

It is an emirp because it is prime and its reverse (71828381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18382817 - 2² = 18382813 is a prime.

It is not a weakly prime, because it can be changed into another prime (18382811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191408 + 9191409.

It is an arithmetic number, because the mean of its divisors is an integer number (9191409).

Almost surely, 2^18382817 is an apocalyptic number.

It is an amenable number.

18382817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18382817 is an equidigital number, since it uses as much as digits as its factorization.

18382817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 18382817 is about 4287.5187463147. The cubic root of 18382817 is about 263.9190188181.

The spelling of 18382817 in words is "eighteen million, three hundred eighty-two thousand, eight hundred seventeen".