312218 has 4 divisors (see below), whose sum is σ = 468330. Its totient is φ = 156108.

The previous prime is 312217. The next prime is 312229. The reversal of 312218 is 812213.

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., 243049 + 69169 = 493^2 + 263^2 .

It is a junction number, because it is equal to n+sod(n) for n = 312196 and 312205.

It is not an unprimeable number, because it can be changed into a prime (312211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78053 + ... + 78056.

2³¹²²¹⁸ is an apocalyptic number.

312218 is a deficient number, since it is larger than the sum of its proper divisors (156112).

312218 is a wasteful number, since it uses less digits than its factorization.

312218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156111.

The product of its digits is 96, while the sum is 17.

The square root of 312218 is about 558.7647089787. The cubic root of 312218 is about 67.8400218513.

It can be divided in two parts, 3 and 12218, that added together give a palindrome (12221).

The spelling of 312218 in words is "three hundred twelve thousand, two hundred eighteen".