255218 has 4 divisors (see below), whose sum is σ = 382830. Its totient is φ = 127608.

The previous prime is 255217. The next prime is 255239. The reversal of 255218 is 812552.

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

It can be written as a sum of positive squares in only one way, i.e., 253009 + 2209 = 503^2 + 47^2 .

It is a junction number, because it is equal to n+sod(n) for n = 255193 and 255202.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255218.

It is not an unprimeable number, because it can be changed into a prime (255217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63803 + ... + 63806.

2²⁵⁵²¹⁸ is an apocalyptic number.

255218 is a deficient number, since it is larger than the sum of its proper divisors (127612).

255218 is a wasteful number, since it uses less digits than its factorization.

255218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127611.

The product of its digits is 800, while the sum is 23.

The square root of 255218 is about 505.1910529691. The cubic root of 255218 is about 63.4313226127.

The spelling of 255218 in words is "two hundred fifty-five thousand, two hundred eighteen".