1223556642 has 192 divisors, whose sum is σ = 3522355200. Its totient is φ = 297354240.

The previous prime is 1223556619. The next prime is 1223556647. The reversal of 1223556642 is 2466553221.

1223556642 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 5 + 5 + 6 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1223556597 and 1223556606.

It is not an unprimeable number, because it can be changed into a prime (1223556647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2554159 + ... + 2554637.

It is an arithmetic number, because the mean of its divisors is an integer number (18345600).

Almost surely, 2^1223556642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223556642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761177600).

1223556642 is an abundant number, since it is smaller than the sum of its proper divisors (2298798558).

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

1223556642 is a wasteful number, since it uses less digits than its factorization.

1223556642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 1223556642 is about 34979.3745227098. The cubic root of 1223556642 is about 1069.5670773157.

The spelling of 1223556642 in words is "one billion, two hundred twenty-three million, five hundred fifty-six thousand, six hundred forty-two".