8409409 has 2 divisors, whose sum is σ = 8409410. Its totient is φ = 8409408.

The previous prime is 8409403. The next prime is 8409413. The reversal of 8409409 is 9049048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 2259009 = 2480^2 + 1503^2 .

It is a cyclic number.

It is not a de Polignac number, because 8409409 - 2⁵ = 8409377 is a prime.

It is not a weakly prime, because it can be changed into another prime (8409403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204704 + 4204705.

It is an arithmetic number, because the mean of its divisors is an integer number (4204705).

Almost surely, 2^8409409 is an apocalyptic number.

It is an amenable number.

8409409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8409409 is an equidigital number, since it uses as much as digits as its factorization.

8409409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 8409409 is about 2899.8981016581. The cubic root of 8409409 is about 203.3551420366.

The spelling of 8409409 in words is "eight million, four hundred nine thousand, four hundred nine".