18873219 has 8 divisors (see below), whose sum is σ = 25844560. Its totient is φ = 12242016.

The previous prime is 18873199. The next prime is 18873227. The reversal of 18873219 is 91237881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18873219 - 2¹³ = 18865027 is a prime.

It is a super-2 number, since 2×18873219² = 712396790843922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18873299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84904 + ... + 85125.

It is an arithmetic number, because the mean of its divisors is an integer number (3230570).

Almost surely, 2^18873219 is an apocalyptic number.

18873219 is a deficient number, since it is larger than the sum of its proper divisors (6971341).

18873219 is a wasteful number, since it uses less digits than its factorization.

18873219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170069.

The product of its digits is 24192, while the sum is 39.

The square root of 18873219 is about 4344.3318243431. The cubic root of 18873219 is about 266.2453264625.

The spelling of 18873219 in words is "eighteen million, eight hundred seventy-three thousand, two hundred nineteen".