4090409 has 8 divisors (see below), whose sum is σ = 4186920. Its totient is φ = 3995136.

The previous prime is 4090403. The next prime is 4090423. The reversal of 4090409 is 9040904.

It can be written as a sum of positive squares in 4 ways, for example, as 1755625 + 2334784 = 1325^2 + 1528^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4090409 - 2⁸ = 4090153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4090403) 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, 9797 + ... + 10205.

It is an arithmetic number, because the mean of its divisors is an integer number (523365).

Almost surely, 2^4090409 is an apocalyptic number.

It is an amenable number.

4090409 is a deficient number, since it is larger than the sum of its proper divisors (96511).

4090409 is a wasteful number, since it uses less digits than its factorization.

4090409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 4090409 is about 2022.4759578299. The cubic root of 4090409 is about 159.9271673722.

The spelling of 4090409 in words is "four million, ninety thousand, four hundred nine".