43909409 has 2 divisors, whose sum is σ = 43909410. Its totient is φ = 43909408.

The previous prime is 43909403. The next prime is 43909433. The reversal of 43909409 is 90490934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 13162384 = 5545^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 43909409 - 2¹² = 43905313 is a prime.

It is not a weakly prime, because it can be changed into another prime (43909403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21954704 + 21954705.

It is an arithmetic number, because the mean of its divisors is an integer number (21954705).

Almost surely, 2^43909409 is an apocalyptic number.

It is an amenable number.

43909409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43909409 is an equidigital number, since it uses as much as digits as its factorization.

43909409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 43909409 is about 6626.4175087297. The cubic root of 43909409 is about 352.7923808607.

The spelling of 43909409 in words is "forty-three million, nine hundred nine thousand, four hundred nine".