1268398393 has 2 divisors, whose sum is σ = 1268398394. Its totient is φ = 1268398392.

The previous prime is 1268398357. The next prime is 1268398399. The reversal of 1268398393 is 3938938621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244466729 + 23931664 = 35277^2 + 4892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268398393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1268398393.

It is not a weakly prime, because it can be changed into another prime (1268398399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634199196 + 634199197.

It is an arithmetic number, because the mean of its divisors is an integer number (634199197).

Almost surely, 2^1268398393 is an apocalyptic number.

It is an amenable number.

1268398393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268398393 is an equidigital number, since it uses as much as digits as its factorization.

1268398393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 1268398393 is about 35614.5811852393. The cubic root of 1268398393 is about 1082.4767099193.

The spelling of 1268398393 in words is "one billion, two hundred sixty-eight million, three hundred ninety-eight thousand, three hundred ninety-three".