43090409 has 4 divisors (see below), whose sum is σ = 43112916. Its totient is φ = 43067904.

The previous prime is 43090391. The next prime is 43090451. The reversal of 43090409 is 90409034.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7425625 + 35664784 = 2725^2 + 5972^2 .

It is a cyclic number.

It is not a de Polignac number, because 43090409 - 2²⁴ = 26313193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43090469) 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 in 3 ways as a sum of consecutive naturals, for example, 8084 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (10778229).

Almost surely, 2^43090409 is an apocalyptic number.

It is an amenable number.

43090409 is a deficient number, since it is larger than the sum of its proper divisors (22507).

43090409 is a wasteful number, since it uses less digits than its factorization.

43090409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22506.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 43090409 is about 6564.3285262089. The cubic root of 43090409 is about 350.5851680460.

The spelling of 43090409 in words is "forty-three million, ninety thousand, four hundred nine".