8078409 has 6 divisors (see below), whose sum is σ = 11668826. Its totient is φ = 5385600.

The previous prime is 8078387. The next prime is 8078429. The reversal of 8078409 is 9048708.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 1108809 = 2640^2 + 1053^2 .

It is not a de Polignac number, because 8078409 - 2⁹ = 8077897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8078429) 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 in 5 ways as a sum of consecutive naturals, for example, 448792 + ... + 448809.

Almost surely, 2^8078409 is an apocalyptic number.

It is an amenable number.

8078409 is a deficient number, since it is larger than the sum of its proper divisors (3590417).

8078409 is a wasteful number, since it uses less digits than its factorization.

8078409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897607 (or 897604 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 8078409 is about 2842.2542110093. The cubic root of 8078409 is about 200.6512851693.

Subtracting 8078409 from its reverse (9048708), we obtain a cube (970299 = 99³).

It can be divided in two parts, 807 and 8409, that added together give a square (9216 = 96²).

The spelling of 8078409 in words is "eight million, seventy-eight thousand, four hundred nine".