18445619 has 2 divisors, whose sum is σ = 18445620. Its totient is φ = 18445618.

The previous prime is 18445601. The next prime is 18445649. The reversal of 18445619 is 91654481.

It is a weak prime.

It is an emirp because it is prime and its reverse (91654481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18445619 - 2²⁰ = 17397043 is a prime.

It is a super-2 number, since 2×18445619² = 680481720586322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18445649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222809 + 9222810.

It is an arithmetic number, because the mean of its divisors is an integer number (9222810).

Almost surely, 2^18445619 is an apocalyptic number.

18445619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445619 is an equidigital number, since it uses as much as digits as its factorization.

18445619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 18445619 is about 4294.8363181849. The cubic root of 18445619 is about 264.2192231353.

The spelling of 18445619 in words is "eighteen million, four hundred forty-five thousand, six hundred nineteen".