1220440056 has 32 divisors (see below), whose sum is σ = 3328473600. Its totient is φ = 369830240.

The previous prime is 1220440033. The next prime is 1220440069. The reversal of 1220440056 is 6500440221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2311176 + ... + 2311703.

It is an arithmetic number, because the mean of its divisors is an integer number (104014800).

Almost surely, 2^1220440056 is an apocalyptic number.

It is an amenable number.

1220440056 is an abundant number, since it is smaller than the sum of its proper divisors (2108033544).

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

1220440056 is a wasteful number, since it uses less digits than its factorization.

1220440056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622899 (or 4622895 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1220440056 is about 34934.7972085140. The cubic root of 1220440056 is about 1068.6581881802.

Adding to 1220440056 its reverse (6500440221), we get a palindrome (7720880277).

The spelling of 1220440056 in words is "one billion, two hundred twenty million, four hundred forty thousand, fifty-six".