18986219 has 4 divisors (see below), whose sum is σ = 21698544. Its totient is φ = 16273896.

The previous prime is 18986207. The next prime is 18986237. The reversal of 18986219 is 91268981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91268981 = 347 ⋅263023.

It is a cyclic number.

It is not a de Polignac number, because 18986219 - 2⁴ = 18986203 is a prime.

It is a super-2 number, since 2×18986219² = 720953023831922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18986219.

It is not an unprimeable number, because it can be changed into a prime (18986249) 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 in 3 ways as a sum of consecutive naturals, for example, 1356152 + ... + 1356165.

It is an arithmetic number, because the mean of its divisors is an integer number (5424636).

Almost surely, 2^18986219 is an apocalyptic number.

18986219 is a deficient number, since it is larger than the sum of its proper divisors (2712325).

18986219 is an equidigital number, since it uses as much as digits as its factorization.

18986219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712324.

The product of its digits is 62208, while the sum is 44.

The square root of 18986219 is about 4357.3178676796. The cubic root of 18986219 is about 266.7756348065.

The spelling of 18986219 in words is "eighteen million, nine hundred eighty-six thousand, two hundred nineteen".