1289438793 has 6 divisors (see below), whose sum is σ = 1862522714. Its totient is φ = 859625856.

The previous prime is 1289438737. The next prime is 1289438809. The reversal of 1289438793 is 3978349821.

It can be written as a sum of positive squares in only one way, i.e., 1122719049 + 166719744 = 33507^2 + 12912^2 .

It is not a de Polignac number, because 1289438793 - 2²⁰ = 1288390217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289438713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71635480 + ... + 71635497.

Almost surely, 2^1289438793 is an apocalyptic number.

It is an amenable number.

1289438793 is a deficient number, since it is larger than the sum of its proper divisors (573083921).

1289438793 is a wasteful number, since it uses less digits than its factorization.

1289438793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143270983 (or 143270980 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 1289438793 is about 35908.7564947604. The cubic root of 1289438793 is about 1088.4293493729.

The spelling of 1289438793 in words is "one billion, two hundred eighty-nine million, four hundred thirty-eight thousand, seven hundred ninety-three".