1289339956 has 12 divisors (see below), whose sum is σ = 2311378020. Its totient is φ = 628946240.

The previous prime is 1289339939. The next prime is 1289339969. The reversal of 1289339956 is 6599339821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 198359056 + 1090980900 = 14084^2 + 33030^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1289339897 and 1289339906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3930751 + ... + 3931078.

It is an arithmetic number, because the mean of its divisors is an integer number (192614835).

Almost surely, 2^1289339956 is an apocalyptic number.

It is an amenable number.

1289339956 is a deficient number, since it is larger than the sum of its proper divisors (1022038064).

1289339956 is a wasteful number, since it uses less digits than its factorization.

1289339956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861874 (or 7861872 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 55.

The square root of 1289339956 is about 35907.3802441782. The cubic root of 1289339956 is about 1088.4015388657.

The spelling of 1289339956 in words is "one billion, two hundred eighty-nine million, three hundred thirty-nine thousand, nine hundred fifty-six".