1243253236 has 12 divisors (see below), whose sum is σ = 2181376512. Its totient is φ = 620002808.

The previous prime is 1243253227. The next prime is 1243253269. The reversal of 1243253236 is 6323523421.

It is a junction number, because it is equal to n+sod(n) for n = 1243253198 and 1243253207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404230 + ... + 407293.

It is an arithmetic number, because the mean of its divisors is an integer number (181781376).

Almost surely, 2^1243253236 is an apocalyptic number.

It is an amenable number.

1243253236 is a deficient number, since it is larger than the sum of its proper divisors (938123276).

1243253236 is a wasteful number, since it uses less digits than its factorization.

1243253236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811910 (or 811908 counting only the distinct ones).

The product of its digits is 25920, while the sum is 31.

The square root of 1243253236 is about 35259.7963125143. The cubic root of 1243253236 is about 1075.2757860298.

Adding to 1243253236 its reverse (6323523421), we get a palindrome (7566776657).

The spelling of 1243253236 in words is "one billion, two hundred forty-three million, two hundred fifty-three thousand, two hundred thirty-six".