5640409 has 2 divisors, whose sum is σ = 5640410. Its totient is φ = 5640408.

The previous prime is 5640403. The next prime is 5640449. The reversal of 5640409 is 9040465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3790809 + 1849600 = 1947^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640409 - 2⁵ = 5640377 is a prime.

It is not a weakly prime, because it can be changed into another prime (5640403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820204 + 2820205.

It is an arithmetic number, because the mean of its divisors is an integer number (2820205).

Almost surely, 2^5640409 is an apocalyptic number.

It is an amenable number.

5640409 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640409 is an equidigital number, since it uses as much as digits as its factorization.

5640409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 5640409 is about 2374.9545258804. The cubic root of 5640409 is about 178.0069117377.

The spelling of 5640409 in words is "five million, six hundred forty thousand, four hundred nine".