3645409 has 2 divisors, whose sum is σ = 3645410. Its totient is φ = 3645408.

The previous prime is 3645407. The next prime is 3645419. The reversal of 3645409 is 9045463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 16384 = 1905^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 3645409 - 2¹ = 3645407 is a prime.

Together with 3645407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3645407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822704 + 1822705.

It is an arithmetic number, because the mean of its divisors is an integer number (1822705).

Almost surely, 2^3645409 is an apocalyptic number.

It is an amenable number.

3645409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645409 is an equidigital number, since it uses as much as digits as its factorization.

3645409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3645409 is about 1909.2954197819. The cubic root of 3645409 is about 153.9035912009.

The spelling of 3645409 in words is "three million, six hundred forty-five thousand, four hundred nine".