7425809 has 2 divisors, whose sum is σ = 7425810. Its totient is φ = 7425808.

The previous prime is 7425773. The next prime is 7425829. The reversal of 7425809 is 9085247.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 286225 = 2672^2 + 535^2 .

It is an emirp because it is prime and its reverse (9085247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7425809 - 2⁸ = 7425553 is a prime.

It is not a weakly prime, because it can be changed into another prime (7425829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3712904 + 3712905.

It is an arithmetic number, because the mean of its divisors is an integer number (3712905).

Almost surely, 2^7425809 is an apocalyptic number.

It is an amenable number.

7425809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7425809 is an equidigital number, since it uses as much as digits as its factorization.

7425809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 7425809 is about 2725.0337612587. The cubic root of 7425809 is about 195.0958021474.

The spelling of 7425809 in words is "seven million, four hundred twenty-five thousand, eight hundred nine".