1289412608 has 112 divisors (see below), whose sum is σ = 2889961200. Its totient is φ = 570163200.

The previous prime is 1289412601. The next prime is 1289412613. The reversal of 1289412608 is 8062149821.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289412601) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3694418 + ... + 3694766.

It is an arithmetic number, because the mean of its divisors is an integer number (25803225).

Almost surely, 2^1289412608 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 1289412608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444980600).

1289412608 is an abundant number, since it is smaller than the sum of its proper divisors (1600548592).

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

1289412608 is an equidigital number, since it uses as much as digits as its factorization.

1289412608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1289412608 is about 35908.3918882481. The cubic root of 1289412608 is about 1088.4219816417.

The spelling of 1289412608 in words is "one billion, two hundred eighty-nine million, four hundred twelve thousand, six hundred eight".