9867394788479 has 4 divisors (see below), whose sum is σ = 10002564580176. Its totient is φ = 9732224996784.

The previous prime is 9867394788473. The next prime is 9867394788529. The reversal of 9867394788479 is 9748874937689.

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 9867394788479 - 2¹² = 9867394784383 is a prime.

It is a super-2 number, since 2×9867394788479² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9867394788394 and 9867394788403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9867394788473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67584895739 + ... + 67584895884.

It is an arithmetic number, because the mean of its divisors is an integer number (2500641145044).

Almost surely, 2^{9867394788479} is an apocalyptic number.

9867394788479 is a deficient number, since it is larger than the sum of its proper divisors (135169791697).

9867394788479 is a wasteful number, since it uses less digits than its factorization.

9867394788479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135169791696.

The product of its digits is 36870930432, while the sum is 89.

The spelling of 9867394788479 in words is "nine trillion, eight hundred sixty-seven billion, three hundred ninety-four million, seven hundred eighty-eight thousand, four hundred seventy-nine".