1243320312 has 64 divisors (see below), whose sum is σ = 3378775680. Its totient is φ = 378974592.

The previous prime is 1243320307. The next prime is 1243320319. The reversal of 1243320312 is 2130233421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243320319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14763 + ... + 52005.

It is an arithmetic number, because the mean of its divisors is an integer number (52793370).

Almost surely, 2^1243320312 is an apocalyptic number.

1243320312 is a gapful number since it is divisible by the number (12) 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 1243320312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1689387840).

1243320312 is an abundant number, since it is smaller than the sum of its proper divisors (2135455368).

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

1243320312 is a wasteful number, since it uses less digits than its factorization.

1243320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37372 (or 37368 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1243320312 is about 35260.7474679707. The cubic root of 1243320312 is about 1075.2951234422.

Adding to 1243320312 its reverse (2130233421), we get a palindrome (3373553733).

The spelling of 1243320312 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, three hundred twelve".