1243156252 has 12 divisors (see below), whose sum is σ = 2342871496. Its totient is φ = 573764400.

The previous prime is 1243156241. The next prime is 1243156259. The reversal of 1243156252 is 2526513421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243156259) by changing a digit.

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, 11953374 + ... + 11953477.

Almost surely, 2^1243156252 is an apocalyptic number.

It is an amenable number.

1243156252 is a deficient number, since it is larger than the sum of its proper divisors (1099715244).

1243156252 is a wasteful number, since it uses less digits than its factorization.

1243156252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23906868 (or 23906866 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 1243156252 is about 35258.4210083208. The cubic root of 1243156252 is about 1075.2478251780.

Adding to 1243156252 its reverse (2526513421), we get a palindrome (3769669673).

The spelling of 1243156252 in words is "one billion, two hundred forty-three million, one hundred fifty-six thousand, two hundred fifty-two".