1220782956 has 24 divisors (see below), whose sum is σ = 2946718320. Its totient is φ = 392895552.

The previous prime is 1220782951. The next prime is 1220782963. The reversal of 1220782956 is 6592870221.

It is a super-2 number, since 2×1220782956² = 2980622051320195872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220782951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1753651 + ... + 1754346.

It is an arithmetic number, because the mean of its divisors is an integer number (122779930).

Almost surely, 2^1220782956 is an apocalyptic number.

It is an amenable number.

1220782956 is an abundant number, since it is smaller than the sum of its proper divisors (1725935364).

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

1220782956 is a wasteful number, since it uses less digits than its factorization.

1220782956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508033 (or 3508031 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1220782956 is about 34939.7045780298. The cubic root of 1220782956 is about 1068.7582637164.

The spelling of 1220782956 in words is "one billion, two hundred twenty million, seven hundred eighty-two thousand, nine hundred fifty-six".