8398809 has 28 divisors (see below), whose sum is σ = 12945492. Its totient is φ = 5443200.

The previous prime is 8398801. The next prime is 8398811. The reversal of 8398809 is 9088938.

It can be written as a sum of positive squares in 2 ways, for example, as 2624400 + 5774409 = 1620^2 + 2403^2 .

It is not a de Polignac number, because 8398809 - 2³ = 8398801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8398801) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 29749 + ... + 30029.

It is an arithmetic number, because the mean of its divisors is an integer number (462339).

Almost surely, 2^8398809 is an apocalyptic number.

It is an amenable number.

8398809 is a deficient number, since it is larger than the sum of its proper divisors (4546683).

8398809 is an equidigital number, since it uses as much as digits as its factorization.

8398809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 8398809 is about 2898.0698749340. The cubic root of 8398809 is about 203.2696635433.

The spelling of 8398809 in words is "eight million, three hundred ninety-eight thousand, eight hundred nine".