218146 has 4 divisors (see below), whose sum is σ = 327222. Its totient is φ = 109072.

The previous prime is 218143. The next prime is 218149. The reversal of 218146 is 641812.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (218143) and next prime (218149).

It can be written as a sum of positive squares in only one way, i.e., 212521 + 5625 = 461^2 + 75^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (218143) by changing a digit.

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, 54535 + ... + 54538.

2²¹⁸¹⁴⁶ is an apocalyptic number.

218146 is a deficient number, since it is larger than the sum of its proper divisors (109076).

218146 is a wasteful number, since it uses less digits than its factorization.

218146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109075.

The product of its digits is 384, while the sum is 22.

The square root of 218146 is about 467.0610238502. The cubic root of 218146 is about 60.1980492593.

Adding to 218146 its reverse (641812), we get a palindrome (859958).

The spelling of 218146 in words is "two hundred eighteen thousand, one hundred forty-six".