1212218 has 8 divisors (see below), whose sum is σ = 2078112. Its totient is φ = 519516.

The previous prime is 1212199. The next prime is 1212221. The reversal of 1212218 is 8122121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1212196 and 1212205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43280 + ... + 43307.

It is an arithmetic number, because the mean of its divisors is an integer number (259764).

2^1212218 is an apocalyptic number.

1212218 is a deficient number, since it is larger than the sum of its proper divisors (865894).

1212218 is an equidigital number, since it uses as much as digits as its factorization.

1212218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86596.

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

The square root of 1212218 is about 1101.0077202272. The cubic root of 1212218 is about 106.6252942850.

Subtracting from 1212218 its sum of digits (17), we obtain a square (1212201 = 1101²).

Adding to 1212218 its reverse (8122121), we get a palindrome (9334339).

Subtracting 1212218 from its reverse (8122121), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1212218 in words is "one million, two hundred twelve thousand, two hundred eighteen".