43439423 has 2 divisors, whose sum is σ = 43439424. Its totient is φ = 43439422.

The previous prime is 43439371. The next prime is 43439441. The reversal of 43439423 is 32493434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43439423 - 2¹⁰ = 43438399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43439423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43439023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21719711 + 21719712.

It is an arithmetic number, because the mean of its divisors is an integer number (21719712).

Almost surely, 2^43439423 is an apocalyptic number.

43439423 is a deficient number, since it is larger than the sum of its proper divisors (1).

43439423 is an equidigital number, since it uses as much as digits as its factorization.

43439423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 32.

The square root of 43439423 is about 6590.8590487128. The cubic root of 43439423 is about 351.5291542746.

The spelling of 43439423 in words is "forty-three million, four hundred thirty-nine thousand, four hundred twenty-three".