1121985792 has 108 divisors (see below), whose sum is σ = 3248347284. Its totient is φ = 372449280.

The previous prime is 1121985751. The next prime is 1121985803. The reversal of 1121985792 is 2975891211.

It can be written as a sum of positive squares in 2 ways, for example, as 630210816 + 491774976 = 25104^2 + 22176^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646558 + ... + 648290.

Almost surely, 2^1121985792 is an apocalyptic number.

1121985792 is a gapful number since it is divisible by the number (12) 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 1121985792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1624173642).

1121985792 is an abundant number, since it is smaller than the sum of its proper divisors (2126361492).

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

1121985792 is a wasteful number, since it uses less digits than its factorization.

1121985792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2019 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 1121985792 is about 33496.0563648917. The cubic root of 1121985792 is about 1039.1122206808.

The spelling of 1121985792 in words is "one billion, one hundred twenty-one million, nine hundred eighty-five thousand, seven hundred ninety-two".