1222556 has 6 divisors (see below), whose sum is σ = 2139480. Its totient is φ = 611276.

The previous prime is 1222537. The next prime is 1222561. The reversal of 1222556 is 6552221.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 152816 + ... + 152823.

It is an arithmetic number, because the mean of its divisors is an integer number (356580).

2^1222556 is an apocalyptic number.

It is an amenable number.

1222556 is a deficient number, since it is larger than the sum of its proper divisors (916924).

1222556 is a wasteful number, since it uses less digits than its factorization.

1222556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305643 (or 305641 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 1222556 is about 1105.6925431602. The cubic root of 1222556 is about 106.9275428748.

Adding to 1222556 its reverse (6552221), we get a palindrome (7774777).

The spelling of 1222556 in words is "one million, two hundred twenty-two thousand, five hundred fifty-six".