43686172393 has 2 divisors, whose sum is σ = 43686172394. Its totient is φ = 43686172392.

The previous prime is 43686172289. The next prime is 43686172403. The reversal of 43686172393 is 39327168634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34585584784 + 9100587609 = 185972^2 + 95397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43686172393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43686172393.

It is not a weakly prime, because it can be changed into another prime (43686172793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21843086196 + 21843086197.

It is an arithmetic number, because the mean of its divisors is an integer number (21843086197).

Almost surely, 2^43686172393 is an apocalyptic number.

It is an amenable number.

43686172393 is a deficient number, since it is larger than the sum of its proper divisors (1).

43686172393 is an equidigital number, since it uses as much as digits as its factorization.

43686172393 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 43686172393 in words is "forty-three billion, six hundred eighty-six million, one hundred seventy-two thousand, three hundred ninety-three".