1243120312 has 32 divisors (see below), whose sum is σ = 2666401920. Its totient is φ = 532251360.

The previous prime is 1243120309. The next prime is 1243120331. The reversal of 1243120312 is 2130213421.

It is a happy number.

It is a super-2 number, since 2×1243120312² = 3090696220213954688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1243120312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50923 + ... + 71269.

It is an arithmetic number, because the mean of its divisors is an integer number (83325060).

Almost surely, 2^1243120312 is an apocalyptic number.

It is an amenable number.

1243120312 is an abundant number, since it is smaller than the sum of its proper divisors (1423281608).

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

1243120312 is a wasteful number, since it uses less digits than its factorization.

1243120312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21451 (or 21447 counting only the distinct ones).

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

The square root of 1243120312 is about 35257.9113391590. The cubic root of 1243120312 is about 1075.2374631715.

Adding to 1243120312 its reverse (2130213421), we get a palindrome (3373333733).

The spelling of 1243120312 in words is "one billion, two hundred forty-three million, one hundred twenty thousand, three hundred twelve".