218248 has 8 divisors (see below), whose sum is σ = 409230. Its totient is φ = 109120.

The previous prime is 218233. The next prime is 218249. The reversal of 218248 is 842812.

It can be written as a sum of positive squares in only one way, i.e., 161604 + 56644 = 402^2 + 238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (218249) by changing a digit.

218248 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, 13633 + ... + 13648.

2²¹⁸²⁴⁸ is an apocalyptic number.

It is an amenable number.

218248 is a deficient number, since it is larger than the sum of its proper divisors (190982).

218248 is a wasteful number, since it uses less digits than its factorization.

218248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27287 (or 27283 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 218248 is about 467.1702045294. The cubic root of 218248 is about 60.2074302003.

The spelling of 218248 in words is "two hundred eighteen thousand, two hundred forty-eight".