8199409 has 2 divisors, whose sum is σ = 8199410. Its totient is φ = 8199408.

The previous prime is 8199391. The next prime is 8199413. The reversal of 8199409 is 9049918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 247009 = 2820^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 8199409 - 2¹³ = 8191217 is a prime.

8199409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8199419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099704 + 4099705.

It is an arithmetic number, because the mean of its divisors is an integer number (4099705).

Almost surely, 2^8199409 is an apocalyptic number.

It is an amenable number.

8199409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8199409 is an equidigital number, since it uses as much as digits as its factorization.

8199409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 8199409 is about 2863.4610177196. The cubic root of 8199409 is about 201.6481228158.

The spelling of 8199409 in words is "eight million, one hundred ninety-nine thousand, four hundred nine".