4089809 has 8 divisors (see below), whose sum is σ = 4370760. Its totient is φ = 3813376.

The previous prime is 4089779. The next prime is 4089823. The reversal of 4089809 is 9089804.

It can be written as a sum of positive squares in 4 ways, for example, as 29584 + 4060225 = 172^2 + 2015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4089809 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4089829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 857 + ... + 2985.

It is an arithmetic number, because the mean of its divisors is an integer number (546345).

Almost surely, 2^4089809 is an apocalyptic number.

It is an amenable number.

4089809 is a deficient number, since it is larger than the sum of its proper divisors (280951).

4089809 is a wasteful number, since it uses less digits than its factorization.

4089809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 4089809 is about 2022.3276193535. The cubic root of 4089809 is about 159.9193473724.

The spelling of 4089809 in words is "four million, eighty-nine thousand, eight hundred nine".