1243021312 has 68 divisors (see below), whose sum is σ = 2679091240. Its totient is φ = 573308928.

The previous prime is 1243021309. The next prime is 1243021331. The reversal of 1243021312 is 2131203421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243021312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851239 + ... + 852697.

Almost surely, 2^1243021312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339545620).

1243021312 is an abundant number, since it is smaller than the sum of its proper divisors (1436069928).

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

1243021312 is an frugal number, since it uses more digits than its factorization.

1243021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1243021312 is about 35256.5073709805. The cubic root of 1243021312 is about 1075.2089190492.

Adding to 1243021312 its reverse (2131203421), we get a palindrome (3374224733).

The spelling of 1243021312 in words is "one billion, two hundred forty-three million, twenty-one thousand, three hundred twelve".