8020409 has 4 divisors (see below), whose sum is σ = 8191104. Its totient is φ = 7849716.

The previous prime is 8020393. The next prime is 8020423. The reversal of 8020409 is 9040208.

8020409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8020409 - 2⁴ = 8020393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8020429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85277 + ... + 85370.

It is an arithmetic number, because the mean of its divisors is an integer number (2047776).

Almost surely, 2^8020409 is an apocalyptic number.

It is an amenable number.

8020409 is a deficient number, since it is larger than the sum of its proper divisors (170695).

8020409 is a wasteful number, since it uses less digits than its factorization.

8020409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170694.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 8020409 is about 2832.0326622410. The cubic root of 8020409 is about 200.1699305771.

The spelling of 8020409 in words is "eight million, twenty thousand, four hundred nine".