5640389 has 2 divisors, whose sum is σ = 5640390. Its totient is φ = 5640388.

The previous prime is 5640377. The next prime is 5640403. The reversal of 5640389 is 9830465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4972900 + 667489 = 2230^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640389 - 2⁴ = 5640373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5640689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820194 + 2820195.

It is an arithmetic number, because the mean of its divisors is an integer number (2820195).

Almost surely, 2^5640389 is an apocalyptic number.

It is an amenable number.

5640389 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640389 is an equidigital number, since it uses as much as digits as its factorization.

5640389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 5640389 is about 2374.9503152698. The cubic root of 5640389 is about 178.0067013426.

The spelling of 5640389 in words is "five million, six hundred forty thousand, three hundred eighty-nine".