1243156268 has 12 divisors (see below), whose sum is σ = 2197952232. Its totient is φ = 615169920.

The previous prime is 1243156259. The next prime is 1243156289. The reversal of 1243156268 is 8626513421.

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 3 ways as a sum of consecutive naturals, for example, 1601618 + ... + 1602393.

It is an arithmetic number, because the mean of its divisors is an integer number (183162686).

Almost surely, 2^1243156268 is an apocalyptic number.

It is an amenable number.

1243156268 is a deficient number, since it is larger than the sum of its proper divisors (954795964).

1243156268 is a wasteful number, since it uses less digits than its factorization.

1243156268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204112 (or 3204110 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 1243156268 is about 35258.4212352170. The cubic root of 1243156268 is about 1075.2478297910.

Adding to 1243156268 its reverse (8626513421), we get a palindrome (9869669689).

The spelling of 1243156268 in words is "one billion, two hundred forty-three million, one hundred fifty-six thousand, two hundred sixty-eight".