18799219 has 4 divisors (see below), whose sum is σ = 19307344. Its totient is φ = 18291096.

The previous prime is 18799199. The next prime is 18799223. The reversal of 18799219 is 91299781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18799219 - 2⁷ = 18799091 is a prime.

It is a super-2 number, since 2×18799219² = 706821270019922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18799519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254007 + ... + 254080.

It is an arithmetic number, because the mean of its divisors is an integer number (4826836).

Almost surely, 2^18799219 is an apocalyptic number.

18799219 is a deficient number, since it is larger than the sum of its proper divisors (508125).

18799219 is an equidigital number, since it uses as much as digits as its factorization.

18799219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508124.

The product of its digits is 81648, while the sum is 46.

The square root of 18799219 is about 4335.8066146912. The cubic root of 18799219 is about 265.8968969329.

The spelling of 18799219 in words is "eighteen million, seven hundred ninety-nine thousand, two hundred nineteen".