12443402500 has 135 divisors (see below), whose sum is σ = 28742047257. Its totient is φ = 4711872000.

The previous prime is 12443402471. The next prime is 12443402533. The reversal of 12443402500 is 520434421.

It is a happy number.

The square root of 12443402500 is 111550.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 10083774724 + 2359627776 = 100418^2 + 48576^2 .

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 128282452 + ... + 128282548.

Almost surely, 2^12443402500 is an apocalyptic number.

12443402500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12443402500 is the 111550-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12443402500

12443402500 is an abundant number, since it is smaller than the sum of its proper divisors (16298644757).

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

12443402500 is an frugal number, since it uses more digits than its factorization.

12443402500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 127 counting only the distinct ones).

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

Multiplying 12443402500 by its sum of digits (25), we get a square (311085062500 = 557750²).

12443402500 divided by its sum of digits (25) gives a square (497736100 = 22310²).

Adding to 12443402500 its reverse (520434421), we get a palindrome (12963836921).

The spelling of 12443402500 in words is "twelve billion, four hundred forty-three million, four hundred two thousand, five hundred".