1243686943 has 2 divisors, whose sum is σ = 1243686944. Its totient is φ = 1243686942.

The previous prime is 1243686937. The next prime is 1243686949. The reversal of 1243686943 is 3496863421.

It is a balanced prime because it is at equal distance from previous prime (1243686937) and next prime (1243686949).

It is an emirp because it is prime and its reverse (3496863421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243686943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243686893 and 1243686902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243686949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621843471 + 621843472.

It is an arithmetic number, because the mean of its divisors is an integer number (621843472).

Almost surely, 2^1243686943 is an apocalyptic number.

1243686943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243686943 is an equidigital number, since it uses as much as digits as its factorization.

1243686943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 46.

The square root of 1243686943 is about 35265.9459393903. The cubic root of 1243686943 is about 1075.4008076005.

The spelling of 1243686943 in words is "one billion, two hundred forty-three million, six hundred eighty-six thousand, nine hundred forty-three".