43928390689 has 2 divisors, whose sum is σ = 43928390690. Its totient is φ = 43928390688.

The previous prime is 43928390669. The next prime is 43928390699. The reversal of 43928390689 is 98609382934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37301128225 + 6627262464 = 193135^2 + 81408^2 .

It is a cyclic number.

It is not a de Polignac number, because 43928390689 - 2¹⁹ = 43927866401 is a prime.

It is not a weakly prime, because it can be changed into another prime (43928390669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21964195344 + 21964195345.

It is an arithmetic number, because the mean of its divisors is an integer number (21964195345).

Almost surely, 2^43928390689 is an apocalyptic number.

It is an amenable number.

43928390689 is a deficient number, since it is larger than the sum of its proper divisors (1).

43928390689 is an equidigital number, since it uses as much as digits as its factorization.

43928390689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 43928390689 in words is "forty-three billion, nine hundred twenty-eight million, three hundred ninety thousand, six hundred eighty-nine".