1323212500 has 72 divisors (see below), whose sum is σ = 2973606552. Its totient is φ = 514800000.

The previous prime is 1323212483. The next prime is 1323212509. The reversal of 1323212500 is 52123231.

It can be written as a sum of positive squares in 12 ways, for example, as 1211318416 + 111894084 = 34804^2 + 10578^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323212509) by changing a digit.

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, 461070 + ... + 463930.

It is an arithmetic number, because the mean of its divisors is an integer number (41300091).

Almost surely, 2^1323212500 is an apocalyptic number.

1323212500 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 1323212500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486803276).

1323212500 is an abundant number, since it is smaller than the sum of its proper divisors (1650394052).

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

1323212500 is an equidigital number, since it uses as much as digits as its factorization.

1323212500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1323212500 is about 36375.9879590919. The cubic root of 1323212500 is about 1097.8504855567.

Adding to 1323212500 its reverse (52123231), we get a palindrome (1375335731).

The spelling of 1323212500 in words is "one billion, three hundred twenty-three million, two hundred twelve thousand, five hundred".