1220556742 has 16 divisors (see below), whose sum is σ = 1838865600. Its totient is φ = 607608000.

The previous prime is 1220556739. The next prime is 1220556761. The reversal of 1220556742 is 2476550221.

It is a junction number, because it is equal to n+sod(n) for n = 1220556698 and 1220556707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583234 + ... + 585322.

It is an arithmetic number, because the mean of its divisors is an integer number (114929100).

Almost surely, 2^1220556742 is an apocalyptic number.

1220556742 is a deficient number, since it is larger than the sum of its proper divisors (618308858).

1220556742 is a wasteful number, since it uses less digits than its factorization.

1220556742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 1220556742 is about 34936.4672226600. The cubic root of 1220556742 is about 1068.6922451514.

The spelling of 1220556742 in words is "one billion, two hundred twenty million, five hundred fifty-six thousand, seven hundred forty-two".