5640989 has 2 divisors, whose sum is σ = 5640990. Its totient is φ = 5640988.

The previous prime is 5640961. The next prime is 5641019. The reversal of 5640989 is 9890465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5484964 + 156025 = 2342^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640989 - 2¹² = 5636893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5640919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820494 + 2820495.

It is an arithmetic number, because the mean of its divisors is an integer number (2820495).

Almost surely, 2^5640989 is an apocalyptic number.

It is an amenable number.

5640989 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640989 is an equidigital number, since it uses as much as digits as its factorization.

5640989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 5640989 is about 2375.0766303427. The cubic root of 5640989 is about 178.0130129779.

The spelling of 5640989 in words is "five million, six hundred forty thousand, nine hundred eighty-nine".