4390909 has 2 divisors, whose sum is σ = 4390910. Its totient is φ = 4390908.

The previous prime is 4390889. The next prime is 4390921. The reversal of 4390909 is 9090934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3319684 + 1071225 = 1822^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 4390909 - 2⁷ = 4390781 is a prime.

4390909 is a modest number, since divided by 909 gives 439 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4390409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2195454 + 2195455.

It is an arithmetic number, because the mean of its divisors is an integer number (2195455).

Almost surely, 2^4390909 is an apocalyptic number.

It is an amenable number.

4390909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4390909 is an equidigital number, since it uses as much as digits as its factorization.

4390909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 4390909 is about 2095.4495937626. The cubic root of 4390909 is about 163.7513210079.

The spelling of 4390909 in words is "four million, three hundred ninety thousand, nine hundred nine".