4243409 has 2 divisors, whose sum is σ = 4243410. Its totient is φ = 4243408.

The previous prime is 4243397. The next prime is 4243411. The reversal of 4243409 is 9043424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4060225 + 183184 = 2015^2 + 428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243409 is a prime.

Together with 4243411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4243429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121704 + 2121705.

It is an arithmetic number, because the mean of its divisors is an integer number (2121705).

Almost surely, 2^4243409 is an apocalyptic number.

It is an amenable number.

4243409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243409 is an equidigital number, since it uses as much as digits as its factorization.

4243409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 4243409 is about 2059.9536402550. The cubic root of 4243409 is about 161.8968123040.

The spelling of 4243409 in words is "four million, two hundred forty-three thousand, four hundred nine".