1222666 has 4 divisors (see below), whose sum is σ = 1834002. Its totient is φ = 611332.

The previous prime is 1222651. The next prime is 1222667. The reversal of 1222666 is 6662221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6662221 = 59 ⋅112919.

It can be written as a sum of positive squares in only one way, i.e., 1147041 + 75625 = 1071^2 + 275^2 .

It is a super-3 number, since 3×1222666³ = 5483334767411112888, which contains 333 as substring.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1222666.

It is not an unprimeable number, because it can be changed into a prime (1222667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305665 + ... + 305668.

2^1222666 is an apocalyptic number.

1222666 is a deficient number, since it is larger than the sum of its proper divisors (611336).

1222666 is an equidigital number, since it uses as much as digits as its factorization.

1222666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611335.

The product of its digits is 1728, while the sum is 25.

The square root of 1222666 is about 1105.7422846215. The cubic root of 1222666 is about 106.9307497291.

Adding to 1222666 its reverse (6662221), we get a palindrome (7884887).

The spelling of 1222666 in words is "one million, two hundred twenty-two thousand, six hundred sixty-six".