43242439 has 2 divisors, whose sum is σ = 43242440. Its totient is φ = 43242438.

The previous prime is 43242383. The next prime is 43242469. The reversal of 43242439 is 93424234.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43242439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43242439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43242469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621219 + 21621220.

It is an arithmetic number, because the mean of its divisors is an integer number (21621220).

Almost surely, 2^43242439 is an apocalyptic number.

43242439 is a deficient number, since it is larger than the sum of its proper divisors (1).

43242439 is an equidigital number, since it uses as much as digits as its factorization.

43242439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 43242439 is about 6575.8983416717. The cubic root of 43242439 is about 350.9969913406.

It can be divided in two parts, 43242 and 439, that added together give a square (43681 = 209²).

The spelling of 43242439 in words is "forty-three million, two hundred forty-two thousand, four hundred thirty-nine".