12320445400 has 96 divisors (see below), whose sum is σ = 29167776000. Its totient is φ = 4838825600.

The previous prime is 12320445373. The next prime is 12320445421. The reversal of 12320445400 is 454402321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3732951 + ... + 3736249.

It is an arithmetic number, because the mean of its divisors is an integer number (303831000).

Almost surely, 2^12320445400 is an apocalyptic number.

12320445400 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 12320445400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14583888000).

12320445400 is an abundant number, since it is smaller than the sum of its proper divisors (16847330600).

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

12320445400 is a wasteful number, since it uses less digits than its factorization.

12320445400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649 (or 3640 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 12320445400 its reverse (454402321), we get a palindrome (12774847721).

The spelling of 12320445400 in words is "twelve billion, three hundred twenty million, four hundred forty-five thousand, four hundred".