12320440000 has 140 divisors (see below), whose sum is σ = 33329212488. Its totient is φ = 4480000000.

The previous prime is 12320439959. The next prime is 12320440007. The reversal of 12320440000 is 4402321.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (12320440007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 426000 + ... + 454000.

Almost surely, 2^12320440000 is an apocalyptic number.

12320440000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12320440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16664606244).

12320440000 is an abundant number, since it is smaller than the sum of its proper divisors (21008772488).

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

12320440000 is an equidigital number, since it uses as much as digits as its factorization.

12320440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28044 (or 28019 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 12320440000 its reverse (4402321), we get a palindrome (12324842321).

The spelling of 12320440000 in words is "twelve billion, three hundred twenty million, four hundred forty thousand".