18348817 has 2 divisors, whose sum is σ = 18348818. Its totient is φ = 18348816.

The previous prime is 18348773. The next prime is 18348829. The reversal of 18348817 is 71884381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 968256 = 4169^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 18348817 - 2¹⁹ = 17824529 is a prime.

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 18348817.

It is not a weakly prime, because it can be changed into another prime (18348857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174408 + 9174409.

It is an arithmetic number, because the mean of its divisors is an integer number (9174409).

Almost surely, 2^18348817 is an apocalyptic number.

It is an amenable number.

18348817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18348817 is an equidigital number, since it uses as much as digits as its factorization.

18348817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 18348817 is about 4283.5519140078. The cubic root of 18348817 is about 263.7562076360.

The spelling of 18348817 in words is "eighteen million, three hundred forty-eight thousand, eight hundred seventeen".