1289052856 has 64 divisors (see below), whose sum is σ = 3030955200. Its totient is φ = 500318208.

The previous prime is 1289052851. The next prime is 1289052901. The reversal of 1289052856 is 6582509821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289052851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21880 + ... + 55288.

It is an arithmetic number, because the mean of its divisors is an integer number (47358675).

Almost surely, 2^1289052856 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 1289052856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1515477600).

1289052856 is an abundant number, since it is smaller than the sum of its proper divisors (1741902344).

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

1289052856 is a wasteful number, since it uses less digits than its factorization.

1289052856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33488 (or 33484 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 1289052856 is about 35903.3822362184. The cubic root of 1289052856 is about 1088.3207473267.

The spelling of 1289052856 in words is "one billion, two hundred eighty-nine million, fifty-two thousand, eight hundred fifty-six".