18348719 has 2 divisors, whose sum is σ = 18348720. Its totient is φ = 18348718.

The previous prime is 18348713. The next prime is 18348749. The reversal of 18348719 is 91784381.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18348719 is a prime.

It is a super-2 number, since 2×18348719² = 673350977881922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18348713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174359 + 9174360.

It is an arithmetic number, because the mean of its divisors is an integer number (9174360).

Almost surely, 2^18348719 is an apocalyptic number.

18348719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18348719 is an equidigital number, since it uses as much as digits as its factorization.

18348719 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18348719 is about 4283.5404748876. The cubic root of 18348719 is about 263.7557380661.

The spelling of 18348719 in words is "eighteen million, three hundred forty-eight thousand, seven hundred nineteen".