1405268857 has 2 divisors, whose sum is σ = 1405268858. Its totient is φ = 1405268856.

The previous prime is 1405268801. The next prime is 1405268867. The reversal of 1405268857 is 7588625041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1151312761 + 253956096 = 33931^2 + 15936^2 .

It is an emirp because it is prime and its reverse (7588625041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405268857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1405268867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702634428 + 702634429.

It is an arithmetic number, because the mean of its divisors is an integer number (702634429).

Almost surely, 2^1405268857 is an apocalyptic number.

It is an amenable number.

1405268857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405268857 is an equidigital number, since it uses as much as digits as its factorization.

1405268857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 1405268857 is about 37486.9158107199. The cubic root of 1405268857 is about 1120.0905690471.

The spelling of 1405268857 in words is "one billion, four hundred five million, two hundred sixty-eight thousand, eight hundred fifty-seven".