18128419 has 2 divisors, whose sum is σ = 18128420. Its totient is φ = 18128418.

The previous prime is 18128401. The next prime is 18128441. The reversal of 18128419 is 91482181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18128419 - 2²³ = 9739811 is a prime.

It is a super-2 number, since 2×18128419² = 657279150879122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18128449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064209 + 9064210.

It is an arithmetic number, because the mean of its divisors is an integer number (9064210).

Almost surely, 2^18128419 is an apocalyptic number.

18128419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18128419 is an equidigital number, since it uses as much as digits as its factorization.

18128419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 18128419 is about 4257.7481137334. The cubic root of 18128419 is about 262.6959093834.

The spelling of 18128419 in words is "eighteen million, one hundred twenty-eight thousand, four hundred nineteen".