1129841856 has 504 divisors, whose sum is σ = 4057893840. Its totient is φ = 298045440.

The previous prime is 1129841851. The next prime is 1129841873. The reversal of 1129841856 is 6581489211.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1129841851) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26275371 + ... + 26275413.

Almost surely, 2^1129841856 is an apocalyptic number.

1129841856 is a gapful number since it is divisible by the number (16) 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 1129841856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028946920).

1129841856 is an abundant number, since it is smaller than the sum of its proper divisors (2928051984).

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

1129841856 is a wasteful number, since it uses less digits than its factorization.

1129841856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 101 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1129841856 is about 33613.1202955037. The cubic root of 1129841856 is about 1041.5318451586.

The spelling of 1129841856 in words is "one billion, one hundred twenty-nine million, eight hundred forty-one thousand, eight hundred fifty-six".