18705219 has 32 divisors (see below), whose sum is σ = 28848960. Its totient is φ = 10678272.

The previous prime is 18705217. The next prime is 18705227. The reversal of 18705219 is 91250781.

It is not a de Polignac number, because 18705219 - 2¹ = 18705217 is a prime.

It is a super-2 number, since 2×18705219² = 699770435675922, 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 18705219.

It is not an unprimeable number, because it can be changed into a prime (18705217) 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 31 ways as a sum of consecutive naturals, for example, 58849 + ... + 59165.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^18705219 is an apocalyptic number.

18705219 is a deficient number, since it is larger than the sum of its proper divisors (10143741).

18705219 is a wasteful number, since it uses less digits than its factorization.

18705219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 18705219 is about 4324.9530633291. The cubic root of 18705219 is about 265.4529763046.

The spelling of 18705219 in words is "eighteen million, seven hundred five thousand, two hundred nineteen".