18808619 has 2 divisors, whose sum is σ = 18808620. Its totient is φ = 18808618.

The previous prime is 18808589. The next prime is 18808639. The reversal of 18808619 is 91680881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18808619 is a prime.

It is a super-2 number, since 2×18808619² = 707528297374322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18808639) 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, 9404309 + 9404310.

It is an arithmetic number, because the mean of its divisors is an integer number (9404310).

Almost surely, 2^18808619 is an apocalyptic number.

18808619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18808619 is an equidigital number, since it uses as much as digits as its factorization.

18808619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18808619 is about 4336.8904759055. The cubic root of 18808619 is about 265.9412075389.

The spelling of 18808619 in words is "eighteen million, eight hundred eight thousand, six hundred nineteen".