1220915980 has 24 divisors (see below), whose sum is σ = 2566604880. Its totient is φ = 487855680.

The previous prime is 1220915963. The next prime is 1220915981. The reversal of 1220915980 is 895190221.

It is not an unprimeable number, because it can be changed into a prime (1220915981) by changing a digit.

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, 12015 + ... + 50854.

It is an arithmetic number, because the mean of its divisors is an integer number (106941870).

Almost surely, 2^1220915980 is an apocalyptic number.

1220915980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220915980 is an abundant number, since it is smaller than the sum of its proper divisors (1345688900).

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

1220915980 is a wasteful number, since it uses less digits than its factorization.

1220915980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63849 (or 63847 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1220915980 is about 34941.6081484525. The cubic root of 1220915980 is about 1068.7970817921.

The spelling of 1220915980 in words is "one billion, two hundred twenty million, nine hundred fifteen thousand, nine hundred eighty".