12389840784 has 80 divisors (see below), whose sum is σ = 36146515840. Its totient is φ = 4062234240.

The previous prime is 12389840761. The next prime is 12389840789. The reversal of 12389840784 is 48704898321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 12389840784.

It is not an unprimeable number, because it can be changed into a prime (12389840789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208732 + ... + 261435.

It is an arithmetic number, because the mean of its divisors is an integer number (451831448).

Almost surely, 2^12389840784 is an apocalyptic number.

It is an amenable number.

12389840784 is an abundant number, since it is smaller than the sum of its proper divisors (23756675056).

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

12389840784 is a wasteful number, since it uses less digits than its factorization.

12389840784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470245 (or 470233 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 12389840784 in words is "twelve billion, three hundred eighty-nine million, eight hundred forty thousand, seven hundred eighty-four".