1218222 has 12 divisors (see below), whose sum is σ = 2639520. Its totient is φ = 406068.

The previous prime is 1218221. The next prime is 1218247. The reversal of 1218222 is 2228121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67679 = 1218222 / (1 + 2 + 1 + 8 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1218195 and 1218204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218221) 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 in 5 ways as a sum of consecutive naturals, for example, 33822 + ... + 33857.

It is an arithmetic number, because the mean of its divisors is an integer number (219960).

2^1218222 is an apocalyptic number.

1218222 is an abundant number, since it is smaller than the sum of its proper divisors (1421298).

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

1218222 is a wasteful number, since it uses less digits than its factorization.

1218222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67687 (or 67684 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1218222 is about 1103.7309454754. The cubic root of 1218222 is about 106.8010394209.

The spelling of 1218222 in words is "one million, two hundred eighteen thousand, two hundred twenty-two".