1155289856 has 144 divisors (see below), whose sum is σ = 2747136000. Its totient is φ = 484549632.

The previous prime is 1155289847. The next prime is 1155289867. The reversal of 1155289856 is 6589825511.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5180561 + ... + 5180783.

Almost surely, 2^1155289856 is an apocalyptic number.

1155289856 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 1155289856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1373568000).

1155289856 is an abundant number, since it is smaller than the sum of its proper divisors (1591846144).

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

1155289856 is an frugal number, since it uses more digits than its factorization.

1155289856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 291 counting only the distinct ones).

The product of its digits is 864000, while the sum is 50.

The square root of 1155289856 is about 33989.5551015308. Note that the first 3 decimals coincide. The cubic root of 1155289856 is about 1049.2935099316.

The spelling of 1155289856 in words is "one billion, one hundred fifty-five million, two hundred eighty-nine thousand, eight hundred fifty-six".