1218212 has 6 divisors (see below), whose sum is σ = 2131878. Its totient is φ = 609104.

The previous prime is 1218211. The next prime is 1218221. The reversal of 1218212 is 2128121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 246016 = 986^2 + 496^2 .

It is not an unprimeable number, because it can be changed into a prime (1218211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152273 + ... + 152280.

It is an arithmetic number, because the mean of its divisors is an integer number (355313).

2^1218212 is an apocalyptic number.

It is an amenable number.

1218212 is a deficient number, since it is larger than the sum of its proper divisors (913666).

1218212 is a wasteful number, since it uses less digits than its factorization.

1218212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304557 (or 304555 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

The square root of 1218212 is about 1103.7264153766. The cubic root of 1218212 is about 106.8007471881.

Subtracting 1218212 from its reverse (2128121), we obtain a palindrome (909909).

The spelling of 1218212 in words is "one million, two hundred eighteen thousand, two hundred twelve".