8479809 has 20 divisors (see below), whose sum is σ = 13643476. Its totient is φ = 5217696.

The previous prime is 8479799. The next prime is 8479813. The reversal of 8479809 is 9089748.

It can be written as a sum of positive squares in 2 ways, for example, as 3814209 + 4665600 = 1953^2 + 2160^2 .

It is not a de Polignac number, because 8479809 - 2⁵ = 8479777 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8479819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2974 + ... + 5079.

Almost surely, 2^8479809 is an apocalyptic number.

It is an amenable number.

8479809 is a deficient number, since it is larger than the sum of its proper divisors (5163667).

8479809 is a wasteful number, since it uses less digits than its factorization.

8479809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8078 (or 8069 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 8479809 is about 2912.0111606929. The cubic root of 8479809 is about 203.9210334505.

The spelling of 8479809 in words is "eight million, four hundred seventy-nine thousand, eight hundred nine".