1243543796 has 24 divisors (see below), whose sum is σ = 2450622720. Its totient is φ = 547012800.

The previous prime is 1243543793. The next prime is 1243543849. The reversal of 1243543796 is 6973453421.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243543793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454481 + ... + 457208.

It is an arithmetic number, because the mean of its divisors is an integer number (102109280).

Almost surely, 2^1243543796 is an apocalyptic number.

It is an amenable number.

1243543796 is a deficient number, since it is larger than the sum of its proper divisors (1207078924).

1243543796 is a wasteful number, since it uses less digits than its factorization.

1243543796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911735 (or 911733 counting only the distinct ones).

The product of its digits is 544320, while the sum is 44.

The square root of 1243543796 is about 35263.9163451821. The cubic root of 1243543796 is about 1075.3595468671.

The spelling of 1243543796 in words is "one billion, two hundred forty-three million, five hundred forty-three thousand, seven hundred ninety-six".