43942078393 has 2 divisors, whose sum is σ = 43942078394. Its totient is φ = 43942078392.

The previous prime is 43942078391. The next prime is 43942078421. The reversal of 43942078393 is 39387024934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41758105104 + 2183973289 = 204348^2 + 46733^2 .

It is a cyclic number.

It is not a de Polignac number, because 43942078393 - 2¹ = 43942078391 is a prime.

Together with 43942078391, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 43942078393.

It is not a weakly prime, because it can be changed into another prime (43942078391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21971039196 + 21971039197.

It is an arithmetic number, because the mean of its divisors is an integer number (21971039197).

Almost surely, 2^43942078393 is an apocalyptic number.

It is an amenable number.

43942078393 is a deficient number, since it is larger than the sum of its proper divisors (1).

43942078393 is an equidigital number, since it uses as much as digits as its factorization.

43942078393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 43942078393 in words is "forty-three billion, nine hundred forty-two million, seventy-eight thousand, three hundred ninety-three".