1220011956 has 60 divisors (see below), whose sum is σ = 3241689220. Its totient is φ = 399997440.

The previous prime is 1220011939. The next prime is 1220011981. The reversal of 1220011956 is 6591100221.

It can be written as a sum of positive squares in 2 ways, for example, as 646888356 + 573123600 = 25434^2 + 23940^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11101 + ... + 50628.

Almost surely, 2^1220011956 is an apocalyptic number.

It is an amenable number.

1220011956 is an abundant number, since it is smaller than the sum of its proper divisors (2021677264).

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

1220011956 is a wasteful number, since it uses less digits than its factorization.

1220011956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61806 (or 61795 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1220011956 is about 34928.6695423688. The cubic root of 1220011956 is about 1068.5332206679.

The spelling of 1220011956 in words is "one billion, two hundred twenty million, eleven thousand, nine hundred fifty-six".