1289794440479 has 4 divisors (see below), whose sum is σ = 1291384816680. Its totient is φ = 1288204064280.

The previous prime is 1289794440419. The next prime is 1289794440491. The reversal of 1289794440479 is 9740444979821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1289794440479 - 2¹² = 1289794436383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289794440419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795186884 + ... + 795188505.

It is an arithmetic number, because the mean of its divisors is an integer number (322846204170).

Almost surely, 2^{1289794440479} is an apocalyptic number.

1289794440479 is a deficient number, since it is larger than the sum of its proper divisors (1590376201).

1289794440479 is an equidigital number, since it uses as much as digits as its factorization.

1289794440479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590376200.

The product of its (nonzero) digits is 146313216, while the sum is 68.

The spelling of 1289794440479 in words is "one trillion, two hundred eighty-nine billion, seven hundred ninety-four million, four hundred forty thousand, four hundred seventy-nine".