18819419 has 2 divisors, whose sum is σ = 18819420. Its totient is φ = 18819418.

The previous prime is 18819389. The next prime is 18819461. The reversal of 18819419 is 91491881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18819419 - 2²⁴ = 2042203 is a prime.

It is a super-2 number, since 2×18819419² = 708341062995122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18819499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409709 + 9409710.

It is an arithmetic number, because the mean of its divisors is an integer number (9409710).

Almost surely, 2^18819419 is an apocalyptic number.

18819419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18819419 is an equidigital number, since it uses as much as digits as its factorization.

18819419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 41.

The square root of 18819419 is about 4338.1354289602. The cubic root of 18819419 is about 265.9920993753.

The spelling of 18819419 in words is "eighteen million, eight hundred nineteen thousand, four hundred nineteen".