1268287939 has 2 divisors, whose sum is σ = 1268287940. Its totient is φ = 1268287938.

The previous prime is 1268287877. The next prime is 1268287963. The reversal of 1268287939 is 9397828621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268287939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1268287939.

It is not a weakly prime, because it can be changed into another prime (1268288939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634143969 + 634143970.

It is an arithmetic number, because the mean of its divisors is an integer number (634143970).

Almost surely, 2^1268287939 is an apocalyptic number.

1268287939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268287939 is an equidigital number, since it uses as much as digits as its factorization.

1268287939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 1268287939 is about 35613.0304663897. The cubic root of 1268287939 is about 1082.4452877851.

The spelling of 1268287939 in words is "one billion, two hundred sixty-eight million, two hundred eighty-seven thousand, nine hundred thirty-nine".