1223656 has 16 divisors (see below), whose sum is σ = 2622240. Its totient is φ = 524400.

The previous prime is 1223633. The next prime is 1223683. The reversal of 1223656 is 6563221.

It is a self number, because there is not a number n which added to its sum of digits gives 1223656.

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 in 3 ways as a sum of consecutive naturals, for example, 10870 + ... + 10981.

It is an arithmetic number, because the mean of its divisors is an integer number (163890).

2^1223656 is an apocalyptic number.

It is an amenable number.

1223656 is an abundant number, since it is smaller than the sum of its proper divisors (1398584).

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

1223656 is a wasteful number, since it uses less digits than its factorization.

1223656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21864 (or 21860 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 1223656 is about 1106.1898571222. The cubic root of 1223656 is about 106.9596027663.

Adding to 1223656 its reverse (6563221), we get a palindrome (7786877).

The spelling of 1223656 in words is "one million, two hundred twenty-three thousand, six hundred fifty-six".