1289568 has 96 divisors (see below), whose sum is σ = 4112640. Its totient is φ = 345600.

The previous prime is 1289567. The next prime is 1289593. The reversal of 1289568 is 8659821.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289567) 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, 12718 + ... + 12818.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2^1289568 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 1289568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2056320).

1289568 is an abundant number, since it is smaller than the sum of its proper divisors (2823072).

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

1289568 is a wasteful number, since it uses less digits than its factorization.

1289568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 132 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 1289568 is about 1135.5914758398. The cubic root of 1289568 is about 108.8465703171.

The spelling of 1289568 in words is "one million, two hundred eighty-nine thousand, five hundred sixty-eight".