18404219 has 2 divisors, whose sum is σ = 18404220. Its totient is φ = 18404218.

The previous prime is 18404201. The next prime is 18404227. The reversal of 18404219 is 91240481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18404219 - 2⁸ = 18403963 is a prime.

It is a super-2 number, since 2×18404219² = 677430553999922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18404191 and 18404200.

It is not a weakly prime, because it can be changed into another prime (18404719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202109 + 9202110.

It is an arithmetic number, because the mean of its divisors is an integer number (9202110).

Almost surely, 2^18404219 is an apocalyptic number.

18404219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404219 is an equidigital number, since it uses as much as digits as its factorization.

18404219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18404219 is about 4290.0138694414. The cubic root of 18404219 is about 264.0214007368.

The spelling of 18404219 in words is "eighteen million, four hundred four thousand, two hundred nineteen".