43122809 has 4 divisors (see below), whose sum is σ = 43151220. Its totient is φ = 43094400.

The previous prime is 43122763. The next prime is 43122817. The reversal of 43122809 is 90822134.

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 31047184 + 12075625 = 5572^2 + 3475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43122809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43122839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11792 + ... + 15009.

It is an arithmetic number, because the mean of its divisors is an integer number (10787805).

Almost surely, 2^43122809 is an apocalyptic number.

It is an amenable number.

43122809 is a deficient number, since it is larger than the sum of its proper divisors (28411).

43122809 is a wasteful number, since it uses less digits than its factorization.

43122809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28410.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 43122809 is about 6566.7959462740. The cubic root of 43122809 is about 350.6730152331.

The spelling of 43122809 in words is "forty-three million, one hundred twenty-two thousand, eight hundred nine".