1220430555 has 24 divisors (see below), whose sum is σ = 2116513152. Its totient is φ = 650557824.

The previous prime is 1220430511. The next prime is 1220430557. The reversal of 1220430555 is 5550340221.

It is a happy number.

1220430555 is a `hidden beast` number, since 1 + 220 + 430 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 1220430555 - 2⁷ = 1220430427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220430557) 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 23 ways as a sum of consecutive naturals, for example, 97462 + ... + 109268.

It is an arithmetic number, because the mean of its divisors is an integer number (88188048).

Almost surely, 2^1220430555 is an apocalyptic number.

1220430555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220430555 is a deficient number, since it is larger than the sum of its proper divisors (896082597).

1220430555 is a wasteful number, since it uses less digits than its factorization.

1220430555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14115 (or 14112 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1220430555 is about 34934.6612263523. The cubic root of 1220430555 is about 1068.6554150418.

Adding to 1220430555 its reverse (5550340221), we get a palindrome (6770770776).

The spelling of 1220430555 in words is "one billion, two hundred twenty million, four hundred thirty thousand, five hundred fifty-five".