8165409 has 12 divisors (see below), whose sum is σ = 12664944. Its totient is φ = 4665864.

The previous prime is 8165407. The next prime is 8165411. The reversal of 8165409 is 9045618.

It is an interprime number because it is at equal distance from previous prime (8165407) and next prime (8165411).

It is not a de Polignac number, because 8165409 - 2¹ = 8165407 is a prime.

It is a Curzon number.

8165409 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8165409.

It is not an unprimeable number, because it can be changed into a prime (8165401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27627 + ... + 27920.

It is an arithmetic number, because the mean of its divisors is an integer number (1055412).

Almost surely, 2^8165409 is an apocalyptic number.

It is an amenable number.

8165409 is a deficient number, since it is larger than the sum of its proper divisors (4499535).

8165409 is a wasteful number, since it uses less digits than its factorization.

8165409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55564 (or 55557 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 8165409 is about 2857.5179789461. The cubic root of 8165409 is about 201.3690159285.

The spelling of 8165409 in words is "eight million, one hundred sixty-five thousand, four hundred nine".