43309423 has 2 divisors, whose sum is σ = 43309424. Its totient is φ = 43309422.

The previous prime is 43309349. The next prime is 43309439. The reversal of 43309423 is 32490334.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43309423 is a prime.

It is a super-2 number, since 2×43309423² = 3751412241185858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43309391 and 43309400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43309223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21654711 + 21654712.

It is an arithmetic number, because the mean of its divisors is an integer number (21654712).

Almost surely, 2^43309423 is an apocalyptic number.

43309423 is a deficient number, since it is larger than the sum of its proper divisors (1).

43309423 is an equidigital number, since it uses as much as digits as its factorization.

43309423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 43309423 is about 6580.9895152629. The cubic root of 43309423 is about 351.1781332433.

Adding to 43309423 its reverse (32490334), we get a palindrome (75799757).

The spelling of 43309423 in words is "forty-three million, three hundred nine thousand, four hundred twenty-three".