1268433857 has 2 divisors, whose sum is σ = 1268433858. Its totient is φ = 1268433856.

The previous prime is 1268433853. The next prime is 1268433893. The reversal of 1268433857 is 7583348621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1209926656 + 58507201 = 34784^2 + 7649^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268433857 - 2² = 1268433853 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268433853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634216928 + 634216929.

It is an arithmetic number, because the mean of its divisors is an integer number (634216929).

Almost surely, 2^1268433857 is an apocalyptic number.

It is an amenable number.

1268433857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268433857 is an equidigital number, since it uses as much as digits as its factorization.

1268433857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 47.

The square root of 1268433857 is about 35615.0790677207. The cubic root of 1268433857 is about 1082.4867983890.

The spelling of 1268433857 in words is "one billion, two hundred sixty-eight million, four hundred thirty-three thousand, eight hundred fifty-seven".