218912 has 12 divisors (see below), whose sum is σ = 431046. Its totient is φ = 109440.

The previous prime is 218887. The next prime is 218923. The reversal of 218912 is 219812.

218912 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 163216 + 55696 = 404^2 + 236^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389 + ... + 3452.

2²¹⁸⁹¹² is an apocalyptic number.

It is an amenable number.

218912 is a deficient number, since it is larger than the sum of its proper divisors (212134).

218912 is an equidigital number, since it uses as much as digits as its factorization.

218912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851 (or 6843 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 218912 is about 467.8803265794. The cubic root of 218912 is about 60.2684269550.

Subtracting 218912 from its reverse (219812), we obtain a square (900 = 30²).

The spelling of 218912 in words is "two hundred eighteen thousand, nine hundred twelve".