1243320000 has 280 divisors, whose sum is σ = 4432468656. Its totient is φ = 305664000.

The previous prime is 1243319989. The next prime is 1243320011. The reversal of 1243320000 is 233421.

It is an interprime number because it is at equal distance from previous prime (1243319989) and next prime (1243320011).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1559602 + ... + 1560398.

Almost surely, 2^1243320000 is an apocalyptic number.

1243320000 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 1243320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216234328).

1243320000 is an abundant number, since it is smaller than the sum of its proper divisors (3189148656).

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

1243320000 is an equidigital number, since it uses as much as digits as its factorization.

1243320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 1243320000 is about 35260.7430437874. The cubic root of 1243320000 is about 1075.2950334970.

Adding to 1243320000 its reverse (233421), we get a palindrome (1243553421).

It can be divided in two parts, 12 and 43320000, that multiplied together give a square (519840000 = 22800²).

The spelling of 1243320000 in words is "one billion, two hundred forty-three million, three hundred twenty thousand".