218512 has 20 divisors (see below), whose sum is σ = 484096. Its totient is φ = 93600.

The previous prime is 218509. The next prime is 218513. The reversal of 218512 is 215812.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 218512.

It is not an unprimeable number, because it can be changed into a prime (218513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864 + ... + 1087.

2²¹⁸⁵¹² is an apocalyptic number.

It is an amenable number.

218512 is an abundant number, since it is smaller than the sum of its proper divisors (265584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218512 is a wasteful number, since it uses less digits than its factorization.

218512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1960 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 218512 is about 467.4526714011. The cubic root of 218512 is about 60.2316967181.

It can be divided in two parts, 2185 and 12, that added together give a cube (2197 = 13³).

The spelling of 218512 in words is "two hundred eighteen thousand, five hundred twelve".