1143887556 has 72 divisors (see below), whose sum is σ = 3124865856. Its totient is φ = 324717120.

The previous prime is 1143887509. The next prime is 1143887561. The reversal of 1143887556 is 6557883411.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86121 + ... + 98511.

Almost surely, 2^1143887556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143887556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562432928).

1143887556 is an abundant number, since it is smaller than the sum of its proper divisors (1980978300).

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

1143887556 is a wasteful number, since it uses less digits than its factorization.

1143887556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12569 (or 12560 counting only the distinct ones).

The product of its digits is 806400, while the sum is 48.

The square root of 1143887556 is about 33821.4067714517. The cubic root of 1143887556 is about 1045.8300391544.

The spelling of 1143887556 in words is "one billion, one hundred forty-three million, eight hundred eighty-seven thousand, five hundred fifty-six".