218154 has 16 divisors (see below), whose sum is σ = 441792. Its totient is φ = 71808.

The previous prime is 218149. The next prime is 218171. The reversal of 218154 is 451812.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218154.

It is an unprimeable number.

218154 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442 + ... + 794.

It is an arithmetic number, because the mean of its divisors is an integer number (27612).

2²¹⁸¹⁵⁴ is an apocalyptic number.

218154 is an abundant number, since it is smaller than the sum of its proper divisors (223638).

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

218154 is a wasteful number, since it uses less digits than its factorization.

218154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461.

The product of its digits is 320, while the sum is 21.

The square root of 218154 is about 467.0695879631. The cubic root of 218154 is about 60.1987851250.

Adding to 218154 its reverse (451812), we get a palindrome (669966).

The spelling of 218154 in words is "two hundred eighteen thousand, one hundred fifty-four".