219904 has 18 divisors (see below), whose sum is σ = 439460. Its totient is φ = 109824.

The previous prime is 219889. The next prime is 219911. The reversal of 219904 is 409912.

219904 is nontrivially palindromic in base 15.

It is an Ulam number.

It is a nialpdrome in base 8.

It is an unprimeable number.

219904 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174 + ... + 685.

2²¹⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

219904 is a deficient number, since it is larger than the sum of its proper divisors (219556).

219904 is an frugal number, since it uses more digits than its factorization.

219904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 219904 is about 468.9392284721. The cubic root of 219904 is about 60.3593252748.

The spelling of 219904 in words is "two hundred nineteen thousand, nine hundred four".