1121986720 has 72 divisors (see below), whose sum is σ = 2739333492. Its totient is φ = 434257920.

The previous prime is 1121986709. The next prime is 1121986721. The reversal of 1121986720 is 276891211.

It can be written as a sum of positive squares in 2 ways, for example, as 1096139664 + 25847056 = 33108^2 + 5084^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1121986720.

It is not an unprimeable number, because it can be changed into a prime (1121986721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150112 + ... + 157408.

Almost surely, 2^1121986720 is an apocalyptic number.

1121986720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121986720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1369666746).

1121986720 is an abundant number, since it is smaller than the sum of its proper divisors (1617346772).

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

1121986720 is an equidigital number, since it uses as much as digits as its factorization.

1121986720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374 (or 7335 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1121986720 is about 33496.0702172658. The cubic root of 1121986720 is about 1039.1125071657.

The spelling of 1121986720 in words is "one billion, one hundred twenty-one million, nine hundred eighty-six thousand, seven hundred twenty".