12389433840 has 160 divisors (see below), whose sum is σ = 48771164160. Its totient is φ = 2831867136.

The previous prime is 12389433829. The next prime is 12389433857. The reversal of 12389433840 is 4833498321.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394584 + ... + 424823.

It is an arithmetic number, because the mean of its divisors is an integer number (304819776).

Almost surely, 2^12389433840 is an apocalyptic number.

12389433840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12389433840 is an abundant number, since it is smaller than the sum of its proper divisors (36381730320).

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

12389433840 is a wasteful number, since it uses less digits than its factorization.

12389433840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819436 (or 819424 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 12389433840 in words is "twelve billion, three hundred eighty-nine million, four hundred thirty-three thousand, eight hundred forty".