1243678936 has 32 divisors (see below), whose sum is σ = 2375082000. Its totient is φ = 610356736.

The previous prime is 1243678921. The next prime is 1243678937. The reversal of 1243678936 is 6398763421.

It is a self number, because there is not a number n which added to its sum of digits gives 1243678936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243678937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380220 + ... + 383476.

Almost surely, 2^1243678936 is an apocalyptic number.

It is an amenable number.

1243678936 is a deficient number, since it is larger than the sum of its proper divisors (1131403064).

1243678936 is a wasteful number, since it uses less digits than its factorization.

1243678936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131 (or 4127 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 1243678936 is about 35265.8324160936. The cubic root of 1243678936 is about 1075.3984997440.

The spelling of 1243678936 in words is "one billion, two hundred forty-three million, six hundred seventy-eight thousand, nine hundred thirty-six".