18818719 has 2 divisors, whose sum is σ = 18818720. Its totient is φ = 18818718.

The previous prime is 18818707. The next prime is 18818749. The reversal of 18818719 is 91781881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18818719 - 2⁵ = 18818687 is a prime.

It is a super-2 number, since 2×18818719² = 708288369601922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18818749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409359 + 9409360.

It is an arithmetic number, because the mean of its divisors is an integer number (9409360).

Almost surely, 2^18818719 is an apocalyptic number.

18818719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18818719 is an equidigital number, since it uses as much as digits as its factorization.

18818719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 43.

The square root of 18818719 is about 4338.0547483867. The cubic root of 18818719 is about 265.9888014205.

The spelling of 18818719 in words is "eighteen million, eight hundred eighteen thousand, seven hundred nineteen".