426749809 has 2 divisors, whose sum is σ = 426749810. Its totient is φ = 426749808.

The previous prime is 426749803. The next prime is 426749833. The reversal of 426749809 is 908947624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375584400 + 51165409 = 19380^2 + 7153^2 .

It is a cyclic number.

It is not a de Polignac number, because 426749809 - 2¹³ = 426741617 is a prime.

It is not a weakly prime, because it can be changed into another prime (426749803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213374904 + 213374905.

It is an arithmetic number, because the mean of its divisors is an integer number (213374905).

Almost surely, 2^426749809 is an apocalyptic number.

It is an amenable number.

426749809 is a deficient number, since it is larger than the sum of its proper divisors (1).

426749809 is an equidigital number, since it uses as much as digits as its factorization.

426749809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 426749809 is about 20657.9236371906. The cubic root of 426749809 is about 752.8777198859.

The spelling of 426749809 in words is "four hundred twenty-six million, seven hundred forty-nine thousand, eight hundred nine".